View source for RBG-16-484, Forwards Responses to Draft SER Open Items,Request for Addl Info Identified in 810805 & 1231 Ltrs & Positions on Licensing Review Group II Issues 1-ASB Through 5-ASB

{{Adams
| number = ML20082U965
| issue date = 12/01/1983
| title = Forwards Responses to Draft SER Open Items,Request for Addl Info Identified in 810805 & 1231 Ltrs & Positions on Licensing Review Group II Issues 1-ASB Through 5-ASB
| author name = Booker J
| author affiliation = GULF STATES UTILITIES CO.
| addressee name = Denton H
| addressee affiliation = NRC OFFICE OF NUCLEAR REACTOR REGULATION (NRR)
| docket = 05000458, 05000459
| license number = 
| contact person = 
| document report number = RBG-16-484, NUDOCS 8312190237
| document type = CORRESPONDENCE-LETTERS, INCOMING CORRESPONDENCE, UTILITY TO NRC
| page count = 157
}}

=Text=
{{#Wiki_filter:y                                                                           ,
GULF STATES                  UTILITIES COMPANY POST O F FIC E 80X 2951        BEAUMONT. TEXAS 77704 AR EA CODE 409 838 6631 December 1, 1983 RBG - 16,484 File Code No. G9.5 G9.8.6.2 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC      20555

==Dear Mr. Denton:==

River Bend Station Units I and 2 Docket Nos. 50-458/50-459 Enclosed are Gulf States Utilities Company responses to the open items identified in the Draft Safety Evaluation Report by the Auxiliary Systems Branch, responses to the request for additional information identified in part by Staff letters dated August 5, 1981 and December 31, 1981, and positions to the Licensing Review Group-II issues 1-ASB through 5-ASB. Attachment 1 of this letter summarizes the open items and indicates changes to be made in the River Bend Station FSAR. Attachment 2 provides a brief discussion of each open item, the response and reference material for each item. Where indicated, these responses will be provided in a future amendment to the FSAR.
Sincerely,
  -                                          ,          /}   n lf L, ( ,$C0)         v J. E. Booker
[. Manager-Engineering, Nuclear Fuels and Licensing River Bend Nuclear Group HP JEB/WJR/ ERG /JEP Enclcsures p"wam              PDR                                             8ool

Fg. I of 4 ATTACHMENT 1 ITEM        DSER                           SUBJECT                      FSAR REVISIONS NUMBER      SECTION
: 1. 3.4.1 Pg 3-10       Control Building MELC/ Flooding frem    January, 1985 3.6.1 Pg 3-29       MELC 2a. 3.5.1.1 Pg 3-13,15  Valve Bonnets, Thermowells, Nuts        December, 1983 3.5.1.2 Pg 3-17     Bolts, Studs, Valve Stems, Fan Failures as possible missiles 2b. 3.5.1.1 Pg 3-14,15  Gravitational Missiles                  Enclosure 1 3.5.1.2 Pg 3-16 12/31/81 letter 2c. 3.5.1.1 Pg 3-14,15  Missiles from Rotating                  December, 1983 3.5.1.2 Pg 3-17     Equipment
: 3. 3.6.1 Pg 3-28       High Energy Pipe Break Analysis         January, 1985 (Pipe Whip and Jet Impingement          (December, 1983)
Analysis) 4a. 4.6 Pg 4-50,52,53   Testing Scram Accumulators /            Technical Specifications Loss of Both CRD Pumps 4b. 4.6 Pg 4-50,52,53   CRD System Air Pressure Bleedoff        N/A Sa. 5.2.5 Pg 5-14,22    LDS Accuracy and Capability             N/A Sb. 5.2.5 Pg 5-17,22    Intersystem Leakage Accuracy            N/A Sc. 5.2.5 Pg 5-19,22    Availability and LCO's for LDS          Technical Specifications 5d. 5.2.5 Pg 5-20,21,22 Account for All RCPB LDS                Enclosure 2 6a. 6.7.3 Pg 6-73       MSIV Leak Rate                          Technical Specifications 6b. 6.7.4 Pg 6-74       RV and MSL Delta-P                      Enclosure 3
: 7. 9.1.1 Pg 9-6        NF Storage Racks                        Enclosure 4
: 8. 9.1.2 Pg 9-10,11    SF Racks Criticality Analysis           December, 1983 9a. 9.1.3 Pg 9-16       Heat Load Assumptions                   Enclosure 5 9b. 9.1.3 Pg 9-16       Cooling of SF in UCSFP                  Technical Specifications (Enclosure 6) 9c. 9.1.3 Pg 9-17       RHR and FPC Interconnection             N/A 9d. 9.1.3 Pg 9-17       SFP Siphon Breaker Failure              N/A

Pg. 2 of 4 l9e.                9.1.3 Pg 9-18                                    Containment SFP Siphon Breakers                                                                    N/A
;   10a.               9.1.4 Pg 9-24                                    FB Bridge Crane Failure                                                                            N/A 10b.               9.1.4 Pg 9-26                                     Fuel Transfer Tube Cooling                                                                        Enclosure 7 4
i 10c.               9.1.4'Pg 9-27                                    Light Load Max KE                                                                                  Enclosure 8 l   11.                9.1.5 Pg 9-30,33                                 Heavy Loads /NUREG-0612                                                                            October, 1984 (Enclosure 9) 11a.               9.1.5 Pg 9-32                                    SF Cask Drop Analysis                                                                              Enclosure 10 8/5/81 letter i
,   lib.               9.1.5 Pg 9-32                                  -Polar Crane Movement During Refueling                                                               N/A 11c.               9.1.5 Pg 9-32,33                                 Polar Crane and RG 1.13, C.5                                                                       N/A i                                                                                                                                                                                             i lid.              .9.1.5 Pg 9-33                                    Polar Crane Drops Into RV                                                                          October, 1984
,   lle.               9.1.5 Pg 9-32                                    Polar Crane Drops and RG 1.13, C.6                                                                 N/A 12a.               9.2.2 Pg 9-41                                    RPCCW Failure Due to HELB                                                                          Enclosure 11 i   12b.               9.2.2 Pg 9-41                                    RPCCW Failure Due to Internal Missiles                                                             Enclosure 12
: 13.                9.2.3 Pg 9-44                                    Makeup Water Treatment System Pressure                                                             Enclosure 13 14a.               9.2.6 Pg 9-58                                    Flooding Due to Failure of CST                                                                     Enclosure 14 9.3.3 Pg 9-81,83 14b.               9.2.6 Pg 9-58                                    Crack in CST to HPCS/RCIC Piping                                                                   Amendment 7 14c.               9.3.3 Pg 9-81                                 _ Leakage Collection for CST                                                                          N/A
: 15.                9.2.8 Pg 9-64,65                                 Flooding Safety-Related Equipment                                                                  January, 1985 9.2.9 Pg 9-67                                    Due to RPCCW, VCWS, CTMW Systems 9.2.11 Pg 9-70                                   Failure (MELC Analysis) 16a.               9.3.1 pg 9-72,75                                 PVLCS and SRV Safety Class Interface                                                               N/A 4
16b.               9.3.1 Pg 9-73,75                                 Compressed Air Supply Qualify                                                                      Enclosure 15 16c.               9.3.1 Pg 9-73,76                                 Compressed Air Supply Testing                                                                      N/A 17a.               9.3.3 Pg 9-80,83                                 Describe Equipment and Floor                                                                       Enclosure 16 Drainage Systems 17b.               9.3.3 Pg 9-81,83                                 CST Failure and Environment Protection                                                             Amendment 5 18a.               9.4.1 Pg 9-94                                    CBVS Radiation Detection Failure                                                                   N/A j   18b.               9.4.1 pg 9-95                                    Chlorine and Use of Charcoal in CBVS                                                               N/A

Pg. 3 of 4 18c. .                    9.4.1 pg 9-9G                          CBVS/FBCFS Compliance with 9.4.2 Pg 9-112                         RG 1.52, C.2a-C.2f and C.2k                                                                Enclosure 17 18d.                      9.4.1 Pg 9-96                          CBVS/FBCFS Delta-P and Flow                                                                Enclosure 18 9.4.2 Pg 9-113                         Rate Records per RG 1.52, C.2g
  ;   18a.                      9.4.1 Pg 9-96                          AABC Test for CBVS, FBCFS,                                                                 Enclosure 19 &
  !                             9.4.2 Pg 9-113                         TFVS and RWVS                                                                              Enclosure 20 19..                      9.4.1 Pg 9-99                          Standby Switchgear Rooms A/C Systems                                                       Enclosure 21 I
: 20.                       9.4.1 Pg 9-103                         CBCWS Interconnect with SSW and                                                            Enclosure 22 Condenser Cooling Water Pumps
: 21.                       9.4.1 Pg 9-96                          CBVS/FBCFS Delta-P and Flow                                                                Enclosure 18 9.4.2 Pg 9-113                         Rate Records per RG 1.52, C.2g 22a.                      9.4.3 Pg 9-119                         Automatic Shutdown of Radwaste                                                             Enclosure 23 i                                                                      Vent System on High Radiation Alarm 22b.                      9.4.3 Pg 9-119, 130 Damper Failure in Radwaste Vent                                                                               N/A System 22c.                      9.4.3 Pg 9-121                         RWVS and TBVS Compliance with RG                                                           Enclosure 24 4                               9.4.4 Pg 9-134                         1.140, C.la-C.1d, C.2a-C.2c and C.2e 22d.                      9.4.3 Pg 9-123                        ABVS and SGTS Damper Failure                                                                N/A i     22e.                      9.4.3 Pg 9-125                        Equipment in Compartments Served                                                            Enclosure 25 by ABVS 22f.                      9.4.3 Pg 9-125                        ABVS Unit Coolers Safety & Seismic Class Enclosure 26
:                                                                                                                                                                 Enclosure 27 4
22 9.                      9.4.3 Pg 9-125                        Area Served By Each ABVS Unit Cooler                                                        Enclosure 27 22h.                       9.4.3 Pg 9-126                        AB Areas Not Cooled Following                                                               Enclosure 27 I
DBA or H2gn Rad Signal                                                                     Enclosure 28 4
i 221.                       9.4.3 Pg 9-129                        ABVS Portion of SGTS Compliance                                                             Enclosure 29 with RG 1.52, C.2
!    22j.                       9.4.3 Pg 9-129                        Maintenance of 40*F in AB                                                                  Enclosure 30 12/31/81 letter 23a.                       9.4.3 Pg 9-121                        RWVS and TBVS Compliance with RG                                                           Enclosure 24 l                               5.4.4 Pg 9-134                         1.140, C.la-C.1d, C.2a-C.2c and C.2e 23b.                       9.4.4 Pg 9-135                        TB Sample Room A/C System                                                                  Enclosure 31 23c.                       9.4.4 Pg 9-135                        TBVS Compliance with RG 1.29,                                                              N/A C.2 and C.3 1

Pg. 4 of 4 24a. 9.4.5.1 Pg 9-139 Maintenance of Minimum Temp in DGB   Enclosure 32 12/31/81 letter 24b. 9.4.5.2 Pg 9-142 Maintenance of Humidity and Minimum  Enclosure 32 12/31/81 letter  Temp in Switchgear and Pump Rooms in SSWPH 25,  9.2.5 Pg 9-59    Water for Heat Removal, GDC-44       N/A 9.2.7 Pg 9-63
: 26. N/A              LRG-II Positions 1-ASB through 5-ASB N/A

Pg. 1 of 16 ATTACHMENT 2 RESPONSES TO DSER OPEN ITEMS                ,
: 1. 3.4.1   The applicant must show that all safety-related equipment in the control building is protected against flooding as a result of a moderate energy line crack within the control building.
(DSER Pages 3-10; 3-29).

===Response===
As stated in the response to FSAR Question 210.54 (MEB), an analysis of flooding resulting from a moderate energy line crack and its effect on safety related equipment will be provided by the end of January 1985. The analysis will be performed using the methodology described in FSAR Section 3.6.
: 2. 3.5.1.1 Incomplete evaluations of missiles - did not include 3.5.1.2 valve bonnets, thermowells, nuts, bolts, studs, valve stems, fan failures, and gravitational missiles.
(DSER Pages 3-13 to 3-17) .

===Response===
: a. Justification for not viewing components such as valve bonnets, thermowells, nuts, bolts, studs, and valve stems as possible missiles will be provided by the end of December 1983 in the response to FSAR Question 410.15.
: b. Gravitational missiles are addressed in the attached proposed response to FSAR Question 410.16 (Enclosure 1).
This response will be incorporated into the FSAR in a future amendment.
: c. The effects of missiles from rotating equipment, including fans, en safety related equipment both inside and outside of containment will be evaluated, and the results provided by the end of December 1983.
: 3. 3.6.1   HELB analysis is not complete; has not provided the results of a compartmental flooding analysis and detailed information on the environmental effects of a HELB and MELB.    (DSER Pages 3-28; 3-29).

===Response===
Updated and revised tables and figures for the pipe whip and jet impingement analysis have been developed and will be submitted by the end of December 1983. Completion of the high energy pipe break analyses is scheduled for completion by the end of January 1985 (see related Questions 410.3, 210.45, and 210.46).

Pg. 2 of 16 Moderate energy line cracks are addressed in the response to Item 1.
Examples of sd3 compartment pressure analyses for high energy line breaks outside containment (assumptions, methods, and results) are provided in FSAR Appendix 3B.
: 4. 4.6            Verify by test that the scram accumulators will maintain the capability to scram for 20 minutes after loss of both CRD pumps i                             and that the scram function is maintained in the event of slowly decaying air pressure in the scram discharge inlet and outlet valves.                  (DSER Pages 4-50; 4-51; 4-53)

===Response===
: a. Testing of the scram accumulators will be specified in the plant Technical Specifications (STS Section 3/4.1.3.3).                 In addition, a pre-operational test will be
  !                                   conducted implementing the technical specification requirements,
: b. Slowly decaying air pressure in the scram discharge inlet and outlet valves could result in the discharge of water to the scram discharge volume. The scram discharge volume is monitored for accumulated water, and the reactor will scram before the volume is reduced to a point that could interfere with a scram. See FSAR Section 4.6.1.1.2.4.2.5.
: 5. 5.2.5           The applicant must:
a) provide assurance that the use of the containment floor drain sump will provide an accuracy of leak rate measurement of I gpm or better and the capability to detect a leakage
 ,                                  rate of I gpm in less than one hour.
b) show how leakage from the primary system into the HPCS, LPCS, RCIC (both water and steam lines), and RHR systems is detected when these systems are supposedly isolated from the primary system.                                                                            ,
i                              c) specify the availability of the leakage detection methods and limiting conditions for operation based upon this availability in order to meet the guidelines of Regulatory Guide 1.45, Position C.9.
I d) revise the FSAR to include a discussion of the sensars (tempera- ture, pressure, and radioactivity - both gaseous and particulate within containment but outside of the i                                  drywell) and verify that all systems and measurements which l                                  are part of the reactor coolant pressure boundary leakage detection system are accounted for. (DSER Pages 5-14, 5-17, 5-19, 5-20 to 5-22).
i

Pg. 3 of 16

===Response===
l l'
: a.           The leak detection containment floor drain sump level transmitters have a range of 0 to 36 inches and an accuracy of 0.25 percent, or 0.09 inches. For an inflow of I gpm, the sump level increases at approximately 0.1. inches per minute. The rate converter has a range of 0 to 10 gpm with a total channel accuracy of 4 percent.
Therefore, the design requirement to detect 1 gpm in I hour is readily met. This information will be incorporated into the FSAR in a future amendment,
: b.             As discussed in FSAR Section 5.2.5, various measurements are available to detect leakage of primary coolant into the HPCS, LPCS, RCIC, and RHR systems,
: c.            Limiting Conditions for Operation of the leak detection system will be contained in the plant Technical Specifications (STS Section 3/4.4.3).
: d.            The response to this request is provided in revised FSAR Section 5.2.5.1.2 (Enclosure 2). This information will be incorporated into FSAR in a future amendment.
: 6.      6.7                          Specify the maximum allowable leakage rate and the differential pressure across the MSIVs.                               (DSER Pages 6-73, 6-74).

===Response===
: a.            Maximum allowable leakage rate across the main steam isolation valves (MSIV) will be specified in the plant Technical Specification (STS Section 3/4 6.1).
The MSIV leakage rate limit will be established based on l                                                       the amount of sealing air supplied by the MS-PLCS. The i                                                       sealing system air compressor capacity will be pro-rated by valve diameter for each valve sealed by the PVLCS and the MS-PLCS such that the total leakage from all valves x                                                       including ADS accumulator makeup requirements is less than
!                                                       the compressor capacity. Consideration will be given to l                                                       the following:
i
: 1.            The containment and drywell are not over pressurized by inleakage of air when the PVLCS
,                                                                                    and MS-PLCS are in operation.
: 2.            Offsite accident doses do not exceed 10CFR100 criteria and doses within the main control room do not exceed GDC 19 criteria when including the contribution from MSIV leakage (at the established limiting rate) for 20 minutes i                                                                                    post-accident (i.e., prior to MS-PLCS initiation).

e-Pg. 4 of 16 1
: 3. This is consistent with LRG-II position I-AEB.
: b. The differential pressure maintained between the reactor vessel and the pressurized portion of the main steam line by the main steam positive leakage control system (MS-PLCS) is 8.5 psi. This is shown in revised FSAR Section 6.7.2.2 (Enclosure 3). This response will be incorporated into the FSAR in a future amendment.
;  7. 9.1.1 The applicant must provide assurance that k gg in excess of
 ;          0.98 will not be attained in the new fuel sIorage racks (under optimum moderation). The nature of the administrative controls and the times and conditions under which the new fuel covers will be removed should be addressed.     (DSER Page 9-6).

===Response===
A description of the new fuel storage vault covers is provided in revised FSAR Sections 9.1.1.2 and 9.1.1.3.1 (Enclosure 4).
This response will be incorporated into the FSAR in a future amendment.
: 8. 9.1.2 The applicant has not provided a criticality analysis to confirm the criticality limits to be attained in the spent fuel storage facility.     (DSER Pages 9-10, 9-11).

===Response===
As stated in the current response to FSAR Question 410.6, the criticality analysis for the fuel building spent fuel storage racks will be provided by the end of December 1983. This analysis will verify that k gg will be 0.95 under all normal and abnormal storage conditions.
i  9. 9.1.3 The applicant should:
i a) provide the number of fuel bundles and frequency assumed for " normal" refueling so that the heat load calculations for the spent fuel pool may be verified.
b) show that the spent fuel stored in the dryer storage pool can be cooled in the event of a DBA or loss of offsite power combir.ed with the worst single active failure.
c) show the interconnection of the RHR system with the fuel pool cooling system, d) show that the syphon breaker design precludes failure so as to cause a reduction in the level of the spent fuel pool in the fuel building below 10 feet above the top of the fuel.
!                (DSER Pages 9-16 to 9-18),
i           e) [See Draft SER Page 9-18 relative to why syphon breakers
!               are not required for the dryer storage pool.]
L a
l                                                                                I.

Pg. 5 of 16

===Response===
: a. Assumptions used for the heat load calculations for the fuel building spent fuel pool are provided in revised FSAR Section 9.1.3.1.1 (Enclosure 5). This response will be incorporated into the FSAR in a future amendment.
: b. The plant Technical Specifications will prohibit storage of spent fuel in the containment pool during normal plant operation. See revised response to FSAR Question 410.30 (Enclosure 6). FSAR Sections 9.1.3.2.1 and 9.1.3.3 describe the method of cooling the containment fuel pool.
This revised response will be incorporated into the FSAR in a future amendment.
: c. FSAR Section 9.1.3.2.1 describes the interconnection between the RHR system and the fuel pool cooling system.
This interconnection is shown on FSAR Figures 9.1-23a and i                      5.4-12. Its function as a cooling source is described in FSAR Section 9.1.3.3.
: d. Antisiphoning devices are provided on the fuel building and containment spent fuel pool piping to ensure that, in the event of a pipe break, the pool water is not siphoned to a level less than 10 feet above the top of the fuel.                                      ,
The minimum required water shielding depth is 8 ft.- 6 in.
above the top of the fuel.
t                      Two types of siphon breakers are utilized:
;                      i.       A            in. diameter hole is drilled in the highest portion of the pipe on those pipes that do not extend to the bottom of the pools.
1
: 11.      A piece of             in. pipe extending above the minimum required water level is used on pipes that extend to the bottom of the pools. This piece of pipe is tapped to accept a pipe plug, which is inserted only when it is desired to draw down or empty a pool for maintenance purposes.
The above-described siphon breakers are passive devices that admit air to the piping system to stop siphon-induced flow. There is no active failure which would preclude to operation of these devices. This information will be invarporated into the FSAR in a future amendment,
: e. The dryer storage pool is provided with siphon breakers as shown in Figure 9.1-23a.

Pg. 6 of 16 10, 9.1.4            The applicant should:
a) show that damage to the fuel building bridge crane is sufficiently limited in the event of an SSE so that either the crane retains its integrity or that any part of the crane becoming dislodged would not result in damage to the spent fuel, the spe.,t fuel pool, or the spent fuel cooling system.
b) discuss what provisions are made for cooling the maximum number of spent fuel bundles in the fuel transfer tube during normal transfer operations and in the event fuel bundles become lodged in the tube. The possibility of a dry tube should also be discussed.
                               -c) provide and analysis to show that the maximum kinetic energy resulting from a fall of any object which weighs less than a fuel bundle and its handling tool, when over spent fuel in either containment or the fuel building storage-facilities will not exceed that obtained in the fall of a fuel bundle and its handling tool (Fuel Handling Accident).
(DSEE Pages 9-24, 9-26, 9-27).

===Response===
: a. Refer to FSAR Sections 9.1.4.2.2.2 and 9.1.4.3. The fuel building bridge crane is equipped with an anti-tipping device (seismic restraint) to prevent the bridge and trolley from leaving the rails during a seismic event.
3 Following installation of the high density spent fuel racks, mechanical blocks attached to the bridge rails will prevent the crane from travelling over or close to the spent fuel pool. Therefore, the dislodging of any major part of the crane will not result in an impact on stored fuel or the spent fuel pool. In addition, within the limits of travel of the crane, there are no spent fuel cooling system equipment or piping which could be impacted by dislodged parts of the crane.
!                               b. The response to this request is provided in revised FSAR Section 9.1.4.2.3.11 (Enclosure 7). This response will be incorporated into the FSAR in a future amendment.
: c. The response to this request is provided in revised FSAR Section 9.1.4.3 (Enclosure 8). This information will be incorporated into the FSAR in a future amendment.
a
: 11. 9.1.5            The Staff will require that the applicant implement the guidelines contained in NUREG-0612 before any operating license can be issued.
 !                              The applicant should:
1 9
a) provide the results of an analysis of a spent fuel cask drop accident which verifies that no unacceptable damage to i
_ _ - _  _ _ _ _  ~ , . _ _         _ -_. _ _ _ _. _ _ _ _ _ _ _ . - _ . _ _ _ _ _ _ _ _ . . _   . - _ _ _ _ _ _

Pg. 7 of 16 the spent fuel storage area or to safety-related equipment I                                    will result from the drop.
b) verify that the polar crane will not be moved over stored fuel when refueling is not in progress, c) show that the polar crane meets the guidelines of Regulatory Guide 1.13, Position C.5, with regard to the effect of a load drop on spent fuel in the containnent pool.
d) provide the results of the calculations of other polar crane load drops (when the loads could drop into the reactor vessel) to determine their effect on spent fuel in the core.     (DSER Pages 9-30, 9-32, 9-33) e) [See Draft SER Pages 9-32 and 9-33 relative to effects of polar crane load drop on the water level in the containment fuel storage pool)

===Response===
The schedule for submittal of the heavy loads analysis (NUREG-0612) is provided in an {{letter dated|date=August 9, 1983|text=August 9, 1983 letter}} from J. E.
Booker to D. G. Eisenhut (Enclosure 9).
: a. The results of the spent fuel cask drop analysis are provided in the partial response to FSAR Question 410.8 (Enclosure 10). This response will be incorporated into the FSAR in a future amendment,
: b. Spent fuel is not stored in the containment pool during normal operation, as noted in the response to Item 9(b).
: c. As noted above, spent fuel is not stored in the containment pool during normal operation. The arrangement of the containment pools is such that deliberate operator positioning of both the bridge and trolley would be
!                                      required to transport heavy loads over spent fuel stored
!                                      in the containment pool. Administrative controls will be implemented to preclude such movement of the polar crane over spent fuel (see FSAR Section 9.1.4.3).
: d. This item will be included in the study performed for NUREG-0612.
: e. The response to this request is identical to Item 11(c) above.
: 12. 9.2.2         The applicant must show that:
a) the safety related portion of the RPCCW will not fail as the result of a HELB.
b) the safety-related portion of the RPCCW is protected against internally generated missiles (FSAR Section 3.5.1 does not list the RPCCW as one of the systems which need to be protected against internally generated missiles.)                                       (DSER l                                    Page 9-41).
   . - . - , _      ~  . _ . . _        _  _

Pg. 8 of 16

===Response===
: a. The safety-related portion of the reactor plant component cooling water system (RPCCW) is protected from the effects of high energy line breaks. See revised FSAR Section 9.2.2.1 and revised Tables 3.6A-23 and 3.6A-24 (Enclosure 11). This response will be incorporated into the FSAR in a future amendment,
: b. FSAR Section 3.5.1 is revised to include the safety-related portion of the RPCCW as one of the items to be protected against internally generated missiles (Enclosure 12). This response will be incorporated into the FSAR in a future amendment.
: 13. 9.2.3   The applicant should show that the pressure in the makeup water treatment system is always greater than the potentially radioactive sources to which it discharges (including during design basis accidents or loss of offsite power) or provide an explanation as to how adjacent or contiguous safety-related systems (including the control building chilled water system) and control room personnel are protected against the intrusion of radioactive water which has passed into the makeup water system, following a seismic event.   (DSER Page 9-44) .
          . Response The response to this request is provided in revised FSAR Sections 9.2.3.2 and 9.2.3.3 (Enclosure 13). This response will be incorporated into the FSAR in a future amendment.
: 14. 9.2.6  The applicant should show:
a) that a catastrophic failure of the CST would not cause flooding of any safety-related systems, including electrical power supplios and controls.
b) that a crack in the piping from the CST to the HPCS/RCIC would not adversely affect the operation of these or other safety-related systems.   (DSER Pages 9-58, 9-81, 9-83).
c) [See Draft DSER Page 9-81 relative to showing the leakage collection sump and pumps for the CST.]

===Response===
: a. This response tc this regnest is provided in revised FSAR Section 9.2.6.3 (Enclosure 14).
: b. This item is addressed in the response to FSAR Question 410.46, submitted to the NRC in Amendment 7
: c. The leakage collection sump and pumps for the condensate storage tank are shown on FSAR Figure 9.2-21a.

Pg. 9 of 16
: 15. 9.2.8                       The applicant must demonctrate that all safety-related systems 9.2.9                        're protected against flooding in the event of a pipe line 9.2.11                      break in the TPCCW system, the VCWS system, and the CTMW sys-tem.         (DSER Pages 9-64, 9-65, 9-67, 9-70) 1                                                  Response These systems will be included in the moderate energy line crack analysis described in the response to item 1.
: 16. 9.3.1                       The applicant should:
a) show that the seismic Category, safety class, and quality group of the compressed air syetem piping and components that interface with the safety / relief valves, b) verify that the compressed air supply for the safety /
relief valves meet the requirements of ANSI MC 11.1-1976 i                                                          with respect to dewpoint, oil or hydrocarbon content, and free of corrosive or hazardous contaminants.
c) commit to periodic testing to the requirement of ANSI MC 11.1-1976. (DSER Pages 9-72, 9-73, 9-75, 9-76).
I

===Response===
: a.         Both the PVLCS and main steam safety and relief valve air systems are Safety Class 2 and Seismic Category I. Their interface is shown on FSAR Figures 5.2-14b, 9.3-13a, and Table 3.2-3 I
: b.          The compressed air supply for the safety / relief valves meets the requirements of ANSI MC 11.1-1976. The requirements of ANSI MC 11.1-1976 are not applicable to the PVLCS and MS-PLCS air systems since they are service
;                                                             air applications, not instrument air. The revised i
response to FSAR Question 410.51 and additional revised FSAR sections describing the air systems are provided (Enclosure 15). This response will be incorporated into the FSAR in a future amendment.
: c.          Periodic testing to assure high quality instrument air meets the requirements of ANSI MC 11.1-1976.
i
: 17. 9.3.3                       The applicant should:
j;                                                a) provide drawings and narrative to complete the description of the equipment and floor drainage systems.
i                                                 b) provide a discussion of the effects of failure of the CST to retain its radioactive contents with respect to preven-l tion of the fluid from entering the environment and flooding of safety-related equipment.         (DSER Pages 9-80, 9-81, 9-83) i
      , . , , .                                                       -... __..-,,,..__-,._m.,             . - _ . , _ . . . _ . .          -m---     .._ _

Pg. 10 of 16 Responte
: a. The response to this request is provided in revised FSAR Section 9.3.3 (Enclosure 16). This response will be incorporated into the FSAR in a future amendment,
: b. The response to this request is provided in the response to FSAR Question 410.10, submitted in Amendment 5.
(Note: Flooding is addressed in Item 14).
: 18. 9.4.1.1 The applicant should:
a) provide the results of an analysis which shows that the worst single failure of the radiation detection system will not allow entrance of radioactive material into the control room, b) clarify whether the recirculating charcoal filter or equi-valent (to be identified by the applicant) is used when the control room is isolated in the event of a chlorine release.
9.4.2   c) profide a detailed response to show compliance with the guidelines of Regulatory Guide 1.52, Positions C.2.a through C.2.f and C.2.k.
d) discuss how the pressure drop across all critical components of each charcoal filtration train in the MCRAC system will be recorded.
9.4.2   e) justify use of the Associated Air Balance Council tests 9.4.3      in lieu of Section 6 of ANSI N510-1975.
9.4.4      (DSER Pages 9-94 to 9-96, 9-112, 9-113, 9-120, 9-134)

===Response===
: a. Redundant radiation detectors are provided in each of the local and remote air intakes. The redundant detectors are powered frem independent power supplies (See Figure           ,
9.4-la). Therefore, a single failure in the radiation
 ,                  detection system does not cause a loss of the safety function of the control building ventilation system. This conclusion has been verified in the Failure Modes and Effects Analysis (FMEA).
: b. The use of the charcoal filtration unit in the event of a chlorine release, as recommended in Regulatory Guide 1.95, is not required (see FSAR Section 2.2.3 for a discussion of potential chlorine release accidents). However, recirculation of the control room air through the charcoal filters in the event of control roem isolation can be
[                   activated manually,
: c. The main control room charcoal filtration units are described in detail in FSAR Sections 6.4.2.2 and 9.4.1, including Table 9.4-2, Item 4. The fuel building charcoal filtration system is described in detail in FSAR Section 9.4.2, including Table 9.4-3, Item 4. Table 6.5-1 l
l i

Pg. 11 of 16 provides an item-by-item comparison of these system designs with the positions of Regulatory Guide 1.52. A detailed description of compliance with positions C.2.a through C.2.f and C.2.k of Regulatory Guide 1.52 is provided in new Section 6.4.4.3 and in revised Section 9.4.2.3 (Enclosure 17). This response will be incorporated into the FSAR in a future amendment.
: d. As indicated in FSAR Table 6.5-1, Note 1 (Enclosure 18),
pressure drop is measured across all critical elements of the main control room charcoal filtration units.
{.                                Continuous recording of these measurements is not provided. However, high pressure drop is alarmed in the
: i.                                main control room, and the alarm is recorded by the plant
  !                                 computer. Flow through the charcoal filtration units is monitored, but not recorded. Low flow actuates the redundant filter unit. This response will be incorporated into the FSAR in a future amendment.
The Surveillance Requirements of the filter units will be contained in the plant Technical Specifications (STS Section 3/4-7.2).
: e. ESF systems ductwork leak tests are performed in accordance with position C.2.1. of Regulatory Guide 1.52.
See revised FSAR Table 6.5-1 (Enclosure 19). This response will be incorporated into the FSAR in a future amendment.
The radwaste and turbine building ventilation systems are leak-tested in accordance with the provision of Section 6 of ANSI N510-1980. See revised FSAR Sections 9.4.3.4.2
;                                  and 9.4.4.4 (Enclosure 20). This response will be incorporated into the FSAR in a future amendment.                                                                   -
4 l      19. 9.4.1.2            The applicant should:
a) revise the FSAR narrative and P&ID to indicate the locations of each of the standby switchgear room AC trains.
b) provide a discussion of the significance of having two l                                feedlines from the SSRAC syrtem to battery room IC while the other two rooms have only one feedline.                                                         (DSER Page 9-99).

===Response===
j                             a. The standby switchgear rooms air-conditioning is located in the Control building at elevation 71'-0". See revised FSAR Section 9.4.1.2.2 and revised FSAR Figure 9.4-16 (Enclosure 21). This response will be incorporated into 4
the FSAR in a future amendment.
: b. There is no significance associated with'having two separate air intake lines to battery room IC. This room
{
I

Pg. 12 of 16 is located close to the ductwork main which makes two intakes a better ductwork arrangement. The other two battery rooms are located further away from the ductwork main. For these two rooms, a single takeoff with a split                                                               '
before entering the room is a better ductwork arrangement.
20, 9.4.1.4                    The applicant should provide revised P& ids to show the condenser cooling water pumps and the associated piping arrangements.               (DSER Page 9-103).

===Response===
The condenser cooling water pumps are shown on Figure 9.2-la, Zones 5-I, 7-I, 9-I, and 10-I.
The cross-ties between the control building chilled water system and the standby service water system are shown on revised FSAR Figures 9.2-9a and 9.2-2b, Zones 2-E and 7-B.
!                                    (Enclosure 22). The revised figures will be incorporated into the FSAR in a future amendment.
;    21. 9.4.2                      The applicant should verify that records of volumetric flow and pressure drop will be kept to assure charcoal train operability in the event they need to be used.                                       (DSER Pages 9-96, 9-113).

===Response===
The response to this request for the fuel building charcoal filtration units is identical to Item 18(d) for the main control room charcoal filtration units.
: 22. 9.4.3                     The applicant should:
a) specify whather the operator will manually shut down the ventilation system upon receipt of a high airborne and radioactivity alarm or whether approval is required by an administrative official.
b) provide a discussion of the effects of roof exhaust damper
,                                       failing open upon a high radiation sianol.
l                                   c) provide a detailed response which shows compliance with the I
guidelines of Pegulatory Guide 1.140, Positions C.I.a through C.I.d and C.2.a through C.2.e.
d) verify that no single failure of the isolation dampers between the auxiliary building ventilation systems and the SGTS, either during normal or accident conditions, will da. mage or defeat the SGTS.
!                                  e) provide a P&ID which shows each compartment of the ABVS and the equipment it serves.                      The room boundaries should be indicated, f) provide the seismic Category and Quality Group classification of the fans in Table 3.2-1.
f
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Pg. 13 of 16 g) verify that the unit cooler information in Table 3.2-1 is correct. If the information is correct FSAR Section 9.4.3 should ref7ect that information, h) provide a discussion for each area of the auxiliary building which is not cooled in the event of a DBA or high radiation signal.
: 1) provide a discussion of compliance with the guidelines of Regulatory Guide 1.52, Position C.2.
j) provide a discussion of the means to maintain the building at the minimum temperature of 40*F and the effects of this minimum temperature on normal operation and maintenance.
(DSER Pagen 9-119, 9-121, 9-123, 9-125, 9-126, 9-129, 9-130, 9-134).

===Response===
: a. The radwaste ventilation system is shut down manually in the event of detection of high airborne radiation in the radwaste building. See revised FSAR Section 9.4.3.3.2, Item 2. (Enclosure 23). This response will be incorporated into the FSAR in a future amendment.
Analyses of the radiological consequences of limiting failures in radioactive gas and liquid waste systems are presented in FSAR Section 15.7. In these analyses, no credit has been taken for any operator action to shutdown or isolate ventilation systems. Therefore, failure of the operator to shut down the radwaste building ventilaticn system upon detection of high airborne radiation does not result in consequences worse than those already analyzed.
: b. The single isolation damper in the radwaste building ventilation system exhaust duct is designed to fail in the closed position. However, if it were to fail in the open position, in conjunction with a high radiation signal, the radiological consequences would be bounded by those analyzed in FSAR Section 15.7. See the discussion under Item 22(a) above.
: c. Compliance of the charcoal filtration system in the radwaste building ventilation system (RBVS) (and in the turbine building ventilation system (TBVS)) is addressed in FSAR Table 1.8-1 and in Table 9.4-6. Specific details r.re provided in revised Section 9.4.3.3 and 9.4.4.3 (Enclosure 24) .
: d. The isolation dampers between the auxiliary building ventilation system (ABVS) and the standby gas treatment system (SGTS) are normally closed, and are opened in the event of an accident (See dampers IHVR*AOD18A and B, Figure 9.4-7a, Zone G-5). These dampers are designed to fail open. As shown in Figure 9.4-7a, these dampers are located in separate, parallel flow paths and are powered

d Pg. 14 of 16 from separate, redundant electric power supplies such that the failure of one damper does not prevent the establishment of the flow path from the APVS to the SGTS.
: e.             The equipment contained in the three safety-related pump rooms served by unit coolers in the ABVS is clarified in the attached revised FSAR Section 9.4.3.2.1.3 3                                                            (Enclosure 25) . The area served by each unit cooler in the ABVS is shown schematically in Figure 9.4-7e.                                                                    This response will be incorporated into the FSAR in a future amendment.
: f.             The response to this request is provided in revised FSAR Table 3.2-1, Item XXXI, (Enclosure 26) and Section 9.4.3.2.1.3 (Enclosure 27). This respense will be incorporated into the FSAR in a future amendment.
: g.             The information in FSAR Table 3.2.-1, Item XXXI, is correct as revised per item 22(f) above. FSAR Section
;                                                            9.4.3 is revised accordingly (Enclosure 27). This response will be incorporated into the FSAR in a future amendment.
I
: h.             The only area of the auxiliary building not cooled in the event of a DBA and/or loss of offsite power or a high radiation signal is the CRD maintenance area. This area is intended for testing and maintenance of CRD mechanisms, and is not required for safe shutdown of the reactor or to mitigate the consequences of an accident. This area is normally cooled by non-safety-related unit cooler 1 HVR-UC14. See the revised FSAR Section 9.4.3.2.1.3 (Enclosure 27) and Table 9.4-4 (Enclosure 28). This
!                                                            response will be incorporated into the FSAR in a future l                                                            amendment.
: i.            The auxiliary building system ductwork conveying exhaust air to the SGTS in the event of a high exhaust radiation j                                                            signal complies with the guidelines of applicable portions of position C.2 of Regulatory Guide 1.52 as described in revised Eection 9.4.3.3.1 (Enclosure 29). This response will be incorporated into the FSAR in a future amendment.
l                                             j.            Auxiliary building heating is provided to prevent l                                                            freezing of fluid systems located in the building. See response to FSAR Question 410.63 (Enclosure 30). This
!                                                            response will be incorporated into FSAR in a future l                                                           amendment.
l Normal operation of equipment at the design minimum temperature of 40*F is not affected as the equipment is l
qualified to this temperature. Normal maintenance is not expected to be adversely affected by the 40*F temperature
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Pg. 15 of 16
: 23. 9.4.4 The applicant should:
a) provide detailed information to show compliance with Regulatory Guide 1.140, Positions C.I.a through C.1.d, C.2.a through C.2.c, and C.2.e.
b) revise P&ID Figure 9.4-4 to include the sample room HVAC system and appurtenances.
c) provide a discussion which shows that the system meets the guideliner of Regulatory Guide 1.29, Positions C.2 and C.3.
(DSER Pages 9-121, 9-134, 9-135).

===Response===
: a. See the response to Item 22(c), which also applies to the charcoal filtration system in the turbine building ventilation system.
: b. A drawing is provided of the turbine building sample room HVAC system (Enclosure 31) . Figure 9.4-4b will be revised and incorporated into the FSAR in a f>1ture amendment.
: c. The turbine building ventilation system (TBVS) is located within the turbine building. The building is a non-Seismic Category I structure. As noted in FSAR Section 9.4.4.1, all components of the TBVS are non-nuclear safety-related, nonseismic,and are nct required to operate following a DBA. Regulatory Guide 1.29, Positions C.2 and C.3, are not applicable to the TBVS.
: 24. 9.4.5 The applicant should:
a) provide a discussion of the operation of the exhaust fan with respect to accommodating the minimum and maximum outside temperatures for both normal and accident conditions.
b) verify that under no conditions will the temperature, pressure or humidity conditions exceed the environmental qualifications of the safety-related equipment in the diesel gerarator rooms and the standby service water switchgear and pump rooms. (DSER Foges 9-139, 9-142).

===Response===
: a. Diesel generator room heating is provided   to maintain the design minimum temperature and to prevent   freezing of fluid systems located in the rooms during  the winter when the diesel generators are not operating. See the response to FSAR Question 410.64 (Enclosure 32). This response will be incorporated into the FSAR in a future amendment.
: b. Heating is provided for the standby service pump rooms and switchgear rooms to maintain the design minimum temperature during the winter. See the response to FSAR Question 410.64 (Enclosure 32).

F                                                                                                                                                      {
Pg. 16 of 16 i
Humidity in the switchgear rooms is uncontrolled. The safety related equipment in these rooms is qualified for the environmental conditions to which it may be subjected.
: 25.                      During the NRC Auxiliary Systems Branch meeting of September 28, 1983 the Staff indicated that this issue has been CLOSED as i                                the result of their review to GSU's compliance with the requirements of General Design Criterion 44.
: 26.                      The endorsement to LRG-II positions 1-ASB through 5-ASB is provided below. This table will be incorporated into the FSAR in a futuro amendment.
Item                           Title                             Endorsed                          FSAR Discussion I-ASB  BWR Scram Discharge Volume                                  Yes                             Q410.17 Modifications 2-ASB  Safe Shutdown for Fires and                                 Yes                             ------
Remote Shutdown Systems 3-ASB  Protection of Equipment in Main                             Yes                             APP 3B and 3.11 Steam Pipe Tunnel 4-ASB  Design Adequacy of the RCIC                                 Yes                             9.4.3.2.1.3 System Description of Pump Room Cooling System 5-ASB  Control Rod Drive System Vessel                             Yes                             ------
Inventory Make-up Rate Test 4
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ENCLOSURE 1 I
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RBS FSAR 1
gj3              QUESTION 410.16 (3.5.1.1, 3.5.1.2)
Provide      assurance                that      in your review you have considered missiles due to gravitational effects (of such components as electrical hoists or any unrestrained equipment and non-safety-related items such as piping, non-Class 1E conduit, instrument tubing trays, structures, HVAC ducting, and non-Class 1E cable trays) during maintenance times,                                       reactor oper,ation and following any abnormal event.
RESPONSE                                                                                          ~
                             .J                                                   is The   response            to this request                  ill hc provided by th; third G22I22       $1932-                in new Section 3.5.1.1.3.
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Amendment 7                                    Q&R 3.5-7                      February 1983
(;':/-

7 RBS FSAR                     _
r o                           4                                 INSERT Section 3.5.1.1.3 3.5.1.2   Internally Generated Missiles (Inside Containment)
Details     for   internally generated missiles         inside    the containment are given in Section 3.5.1.1.
3.5.1.3   Turbine Missiles 3.5.1.3.1    Turbine Placement and Orientation
    .                  Turbine placement and orientation for two units uses a peninsular arrangement as shown in Fig. 3.5-1. The axis of
                      'the   turbine     generator     is oriented in a north-south                     '
direction, with the reactor and auxiliary buildings located to the north on the same centerline.                                       _
Fig. 3.5-1 also indicates the *25-deg missile ejection zone for Icw-trajectory turbine missiles due, to low-pressure turbine discsC*).
Fig. 3.5-1 identifies the Units 1 and 2 target areas for low-trajectory missiles. Applicable surfaces for which the wall areas are considered targets are also shown. The other surfaces have been excluded as targets because they are outside the ejection zone for low-trajectory missiles.
f~               .
missiles, target areas        are the roof For high-trajectory areas of all Seismic Category I structures.
3.5.1.3.2    Missile Identification and characteristics For turbine missile evaluation, a hypothetical missile is
:                     considered to be generated in the disc plane.                 As it i                    penetrates through the stationary turbine parts, the missile
)                      is deflected from the vertical plane.              It    has     been  ' -
determined that      the deflection  angle is  a  maximum   of 5   deg
                       .on each side of the plane of the        disc    for   inner   stage         -
buckets. For last stage buckets, the deflection angles may be up to 25 deg on each side of the plane of the disc.
The missile characteristics used for this turbine missile i
strike probability evaluation have been provided by GEta).
They are listed in Tables 3.5-1 and 3.5-2.
l 3.5.1.3.3    Target Description Structures,     equipment, and components which are required to I                      perform safe shutdown and to maintain the cold shutdown, or l                      to prevent the release of radiation to within allowable limits, are protected against turbine missiles.                These 3.5-5

INSERT (For Page 3.5-5) 3.5.1.1.3   Gravitational Missiles Seismic Category I systems, components, and structures are not potential gravitational missile sources.
Nonseismic items and systems in Seismic Category I buildings are classified as follows:
: a. General All suspended nonsafety-related items such as piping, non-Class IE conduit, instrument tubing structures, and HVAC ducting which could adversely affect safety related equipment in the event of failure are supported to-prevent collapse during an SSE.
s
: b. Cable Tray All cable trays for both Class IE and non-Class IE circuits are seismically supported whether or not a hazard potential is evident.
: c. Equipment for Maintenance All other equipment,which could adversely affect safety related equipment in the event of failure such as hoists, that is required during maintenance is either removed during operation or is restrained to prevent it from becoming a missile.
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ENCLOSURE 2 s
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monitors trip and activate an alarm in the main control room                                                                    i on detection of leakage from monitored components.
{
Excessive leakage inside the drywell (e.g. , process line break or LOCA within drywell) is detected by high drywell' pressure, low reactor water level or steam line flow (for, breaks                 downstream              of    the       flow    elements) .                     The instrumentation channels for these variables trip when the monitoredvariableexceedsapredeterminedlimittoactivate; an     alarm                and trip the isolation logic                    which          closes-appropriate isolation valv6s (Table 5.2-8) .
The     alarms,                  indication            and isolation trip functions initiated by the leak detection systems are summarized in
* Tables 5.2-7 and 5.2-8.
5.2.5.1.2                 Detection of Leakage External to the Drywell (within Containment)
The detection of leakage within the containment (outside the drywell)                is accomplished by detection of increases in containment floor drain sump and containment equipment drain sump fillup time and pumpout time.                                The containment floor drain sump monitors detect unidentified leakage increases with a sensitivity of 50 percent of normal background and
     -)
     '/
activate an alarm in the main control room when total leakage reaches 5 gpm. The containment equipment drain sump monitors                  detect     . identified leakage increase with a sensitivity of 50 percent normal background leakage and activate an alarm in the main control room when total leakage reaches 25 gpm.
INSERT          ;
5.2.5.1.3                 Detection of Leakage External to Containment The areas outside the containment which are monitored for primary coolant leakage are:                                   equipment areas in                     the auxiliary building, the main steam tunnel, and the turbine building.                  The process piping for each system to                                           be monitored for leakage is located in compartments or rooms separate from other systems where feasible so that leakage may be detected by area temperature indications.                                                Each temperature and pressure leakage detection system detects leak rates                  that are less than the established leakage                                                ~
limita. The sumps outside the containment are equipped with a high-high alarm set point.
: 1.                The monitored areas are monitored by dual element thermocouples for sensing high ambient temperature in   the areas and high differential temperature between the inlet and outlet -ventilation ducts
    .} )
     .                                                                5.2-35

INSERT (Fer Page 5.2-35)
In addition, the containment is provided with radiation monitors which could provide an indication of RCPB leakage. These monitors are further described in Sections 11.5.2.1.2.3 and 12.3.4.
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ENCLOSURE 3 l
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8.5 psi above the RBS FSAF                 reactor vessel pressure C:           The MS-PLCS isolation valves remain closed if the main steam line pressure is higher than the pressure interlock set point.      When the interlock is cleared, air is admitted to raise the pressure of the steam lines              {t;;;d      ;;    ;
predete. l..ed diff;;ential
                                                  ;;;;;;;; to due established as the containment leakage barrieE(. Once the valves have cycled open, the pressure interlock function is disarmed and only a system isolation trip signal or the initiating RMS turned to "off" position can actuate.reclosure. A pressure-control valve maintains the required pressure differential between                     ,
the reactor vessel and the pressurized portion of the main steam line.                                                  of 8.5 psi A  5-min      timer is activated when closure of the drain valve           -
is completed. During this time air is injected via a line which bypasses the pressure-control valve in order to provide an initial high flow at 1cw differential pressure to rapidly pressurize the main steam line volume. When the 5-min timer cycle is completed, the bypass flow is isolated and the system air flow is reduced to that required for steady-state operation. If high flow or low differential pressure persists after the timer cycle is completed, an alarm is annunciated in the main control rccm.                Further increase or flow, or continuous reduction of differential
   .           precoure to a cpecified cet point, result in an automatic isolation of the respective MS-PLCS.
The bypass valve automatically closes on either timer set point duration, or upon establishing the required pressure differential between the main steam system and the reactor vessel.
6.7.2.3     Equipment iThe following   equipment   is   provided to accomplish system operation:
: 1. Piping - Prccess     piping    is carbon    steel pipe throughout the system. The portion of the system piping,   connected to the main steam piping between MSIVs,   up to and including the first MS-PLCS isolation valve, is designed and constructed to ASME Section III, Class 1.        The   remainder       is designed    and constructed to ASME Section III, j                          Class 2. The equipment and piping installation is designed to withstand Seismic Category I loads.
l
: 2. Valves - Motor- or sciencid-operated valves provide l                          the required isolation and/or prccess             control The valves are following    system     initiation.
E, 6.7-5

ENCLOSURE 4
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  . , , , _ _ , _            .e,

RBS FSAR
(.sg fuel element support. The rests against the rack to provide lateral design of the racks prevents accidental insertion of     the fuel assembly in a position not intended for the fuel. This is achieved by abutting the sides of each casting     to the adjacently installed casting.          In this way, the only spaces in the assembly are those into which it is intended to insert fuel. The weight of the fuel assembly is supported by the lower tie plate which is seated in a chamfered hole in the base casting.
The material specifications for the racks are ASTM B108,                  s .
alloy SG708-T61, and ASTM B211, alloy 6061-T651.
The floor of the new fuel storage vault is sloped to a drain located at the low point. This drain removes any water that may be accidentally and unknowingly introduced into the vault. The drain is part of the fuel building drain system a          aey       s   a ges        e   q       a  as    system.
INSERT A The radiation monitoring equipment for the new fuel storage area is described in Section 7.6.1.4.
9.1.1.3    Safety Evaluation 9.1.1.3.1    Criticality Control The calculations of keff             are based upon the geometrical arrangements of the fuel array and subcriticality does not depend upon the presence of neutron absorbing materials.
The arrangement of fuel assemblies in the fuel storage racks results in k eff below 0.95 in a dry condition or completely flooded with water which has a density of 1 g/cc.             To meet the      requirements       of    General     Design     Criterion 62, geometrically-safe configurations of fuel stored in the new
                ,-fuel array are employed to assure that keff does not exceed 0.95 if fuel is stored in the dry condition or if the abnormal condition of flooding (water with a density of 1 g/cc) occurs.       In the dry condition, k ef        is maintained 50.95 due to under-moderation.             Inthebloodedcondition, l
the geometry of the fuel storage array assures the k eff I                remains sO.95 due to over-moderation.                No limitation is placed on the size of the new         fuel   storage    array from a criticality standpoint since all calculations are performed i                on an infinite basis.
l l   REPIACE      Administrctivc control; uill bc prcVidcd to prcclud; courcc3 WIDI          of cptimur mcdcrction in th 7c. fucl ctercgc             crca deiing   3 INSERT B      Lhu ocucacnt      of fucl. Additionclly, colid non combuotible a ccvcrc ill Sc prcvided cvcr the fucl *cn pcccibic.
l Amendment 5                    9.1-3                      August 1982
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J' INSERT A (Page 9.1-3)
 ;                              The new fuel storage vault is provided with twelve separate steel 4                               covers to prevent moisture and debris from entering the vault. The covers are fabricated solid steel checked plate, with steel grating attached to the underside. The covers are attached to the fuel building floor by hinges. Gasket material is attached to the fuel building floor providing a seal around the perimeter of the new fuel vault between the covers and the floor.                                                                                                                                    '
i INSERT B (Page 9.1-3)
Administrative controls are provided to preclude removal of the new
!                               fuel stcrage vault covers during times other than:
4
: 1. movement of fuel in or out of the vault                                                                                                                               i
: 2. inspections
: 3. special nuclear material accounting Additionally, administrative controls ate provided to preclude sources of optimum moderation in the new fuel storage vault area.
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RBS FSAR The heat load for normal operation was calculated based on the following:
3
: a. Storage     of 425 percent of an equilibrium core is in the pool.+
* INSERT
: b. A batch      of equilibrium core from the most recent refueling outage is assumed to have been     in    the   pool 150 hr after reactor shutdown,     with the batches from      previous refueling outages in the pool.
: 4. The fuel pool cooling subsystem is designed to remove the decay heat from the combined fuel                .
storage pools'      capacity at a rate sufficient to       ''.
maintain the temperature of the water at or below             -
156 F,   when 525 percent of an equilibrium core is stored in the pools (Fig. 9.1-8). The calculation of the water temperature for this abnormal load with the storage of 525 percent of an equilibrium core was based on the following:
: a. A ' full    core removhl event is assumed'to be required at the time when batches from each of the previous refueling outages, totaling 4.25 cores, are in the pool.
n.
: k. '*
: b. The last refueling outage required 30 days to complete. At the end of the 30-day period, the reactor was started up and brought to full power,    and was    forced tc be     shut   down immediately and the full core was removad, which required 10 days.       Two hundred spent fuel assemblies from the full core were stored      ..
in the containment fuel storage pool.
i     5. The fuel pool cooling subsystem is designed to
* maintain the temperature of the containment fuel storage pool water at or below 127 F, when 30 percent of an equilibrium core is stored in the fuel storage area of the containment pool during refueling operations.
: 6. The decay heat generated by the spent fuel was calculated in accordance with Branch Technical Position ASB9-2.
The fuel pool cooling subsystem is also designed to: 1) provide makeup water to the fuel building pools             and containment pools from the condensate storage tank; 2) provide makeup water       to the fuel building pools       and containment pools from the standby service water system; 3)
{ .:
(i?        Amendment 3                   9.1-17                 April 1982

INSERT (For Page 9.1-17)
This storage is comprised of 200 fuel assemblies removed from the first core after the first 18 months of operation, and 248 assemblies removed each 18 month refueling cycle thereafter. Residual decay energy release rates are calculated in accordance with Branch            j Technical Position ASB 9-2, Rev. 1.
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m ENCLOSURE 6 1
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RBS FSAR h    QUESTIONS 410.3D (9.1.3)                              ,
Will there be a' technical specification                or other provision prohibiting storage of spent fuel inside                 containment   while the reactor is in operation?
Show    that the loss of one RHR train (either "A" or "B" train) will not prevent satisfactory cooling of the reactor core,    containment fuel pool or spent fuel pool during the refueling operation.                 In your consideration,     select that single failure to make the RHR train inoperative which would produce the most severe consequences and explain your selection.

===RESPONSE===
Thor;    ar   n; plans for de clopacnt of a picpceed techuicel cp    ification             or other provicien that would prohibit stcrage of spcnt fuci inside thc containacnt while the re&ctor is in Operations REPLACE WITH INSERT
<w
."[;Ic   Amendment 2                                Q&R 9.1-11          February 1982

INSERT (For Page Q&R 9.1-11)
The plant Technical Specifications will prohibit storage of spent fuel in the containment pool during normal plant operation.
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RBS FSAE provided by a load cell.       Carriage position readout is                             C'M) provided. Cable enclosures, attached to the sheave box and projecting above the containment upper pool water            level,
           . provide   the   means  for  cable exit from the transfer tube while isolating the pcci water from the tube.
A  vent pipe with a fluid stop connected to the containment ventilatica system isclates the displaced air in the tube during filling from the reactor building atmosphere and confines the water surge to the pool water.                                                 -
A  hydraulic power unit is provided in each building to                    ._
actuate the cylinders attached to the upenders, the fill                      ~
valve, the flap valve, and the fuel building gate valve.
In both buildings,      the pool area in which the transfer system components are located is physically separated from the fuel storage area by a concrete wall which serves as a positive barrier to prevent fuel in the storage area from being uncovered in the event of loss of pool water through the transfer system. In addition, these walls are provided with gates to allow drainage of the transfer pool areas for maintenance and/or removal of the transfer            tube         and components.
Control panels are provided in close proximity to each transfer pocl area and are connected for voice and interlock communication. Each panel has control buttons for actuating the upender, a button for initiating the transfer sequence to the other < building and a stop button. The transfer operation functions on an automatic basis with provision made    for    manual   override. Automatic sequencing is             -
accomplished by use of an electronic controller located in the fuel building which utilizes sensors for confirming the                           .
sbccessful completion of each step before initiating the next step.      The completion of a transfer sequence is signaled at the control panels.
INSERT        ;
Interlocks assure the correct sequencing of the transfer system components     and fuel handling     equipment      during automatic or manual override operation. Interlocks prevent the refueling platform frcm moving into the reactor building transfer area unless the gate valve (25) is closed and the upender (7) is in the vertical position and prevent upender movement    if    the   platform is in the transfer area.
Interlocks prevent the fuel handling platform from moving into the fuel building transfer area unless the upender (31) is in the vertical position and prevent novement of the upender if the platform is in the transfer area.
                                                                                                         \
9.1-36

INSERT (Page 9.1-36)
The Inclined Fuel Transfer control system is operated on a semi-automatic basis. Safety interlocks prevent opening the transfer tube bottom valve when the flap valve is open and vice versa to prevent drainage of the Reactor Building fuel transfer pool.
The interlock control system has dual channel logic which provides a backup sensor for each required sensor which provides the redundancy necessary for the system to function safely. The failure of a channel to perform its intended function causes an alarm which identifies the failed channel.
Emergency cooling is available in the unlikely event of the tilt tube becoming lodged in the transfer tube. The worst case scenario would be if the tilt tube, with the maximum heat source (two freshly discharged fuel assemblies), was lodged above the water exit valve with all valves closed and a loss of power and transfer tube leak occured. Thirty minutes is available before the water in the tilt tube boils down to active fuel level, The addition of cooling water i                    by manually opening the water inlet valve or by running a hose j                   through the vent pipes, would be started within thirty minutes. This additional cooling can maintain the fuel at a safe temperature indefinitely.
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                                          #                               - "                         -        _ _ _ . .1 __
t     g ENCLOSURE 8 i
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i INSERT (For Page 9.1-61)
The only items that are transported across the spent fuel pool or the
;                          containment fuel storage pool are the fuel chaianels, the fuel assemblies, or the individual sub-assemblies or components.of these fuel assemblies. These items are handled by the same grapple that handles the entire fuel assembly, and the retraction elevation is limited to insure that the minimum safe water level is maintained i
over the fuel assembly during transport.
The lighter components of the fuel assembly, and the channels, which are muet. lighter than the fuel assemblies, cannot be raised any higher than a fuel assembly. Thus, the kinetic energy associated with an accidental drop is much less than that of a dropped fuel assembly.                                                                                              ,
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(.2h),      cable" signal from the lifting                               cables     indicates                       that    the MU'         fuel assembly is seated.                                                .
In addition to                  the main hoist on the trolley, there is an auxiliary hoist on the trolley, and another hoist on its own monorail.       These three hoists are precluded from operating simultaneously because control power is available to only one of them at a time. The two auxiliary hoists have load cells with interlocks which prevent the hoists from moving anything as heavy as a fuel bundle.
The two au.niliary hoists,have electrical interlocks which prevent the lifting of their loads higher than 8 ft under water.       Adjustable mechanical jam-stops on the cables back up these interlocks.
Administrative procedures and training are provided to control the handling of objects over the spent fuels in both the containment and spent fuel buildings so that the maximum kinetic energy of the object, if dropped from the height at which it is normally handled above a storage rack, does not exceed the kinetic energy assumed in any previously accepted analysis.
INSERT In summary,         the fuel handling system complies with General "g;3       Design Criteria 2, 3, 4,                              5,   61,   62,     and 63, applicable N:e      portions       of     10CFR50,                        and Regulatory Guide 1.13.                                         In           '
addition,       procedures                        and       training,          inspection                        and                    3 maintenance programs will be developed in accordance with                                                      .
Section 5.1 and NUREG-0612.
                                                                                 /
A   system-level,               qualitative-type failure mode and effects analysis relative to                              this       system        is         discussed                         in Section 15A.6.5.
The safety evaluation of the new and spent fuel storage is presented in Sections 9.1.1.3 and 9.1.2.3.
9.1.4.4      Inspection and Testing Requirements 9.1.4.4.1      Inspection Refueling and servicing equipment is subject to the controls of QA required for their safety class.                                     Components defined as essential to safety,                                  such as the fuel storage racks, refueling platform,                   and fuel transfer                             tube                have             an additional          set              of               engineering         specified,                      quality requirements that identify safety-related features which require specific QA verification of compliance to drawing requirements.
Amendment 3                                   9.1-61                                                   April 1982 Ui' 4
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5FULF STATES UTILITIES
* COMPANY PoSToFFICEBOX 2951          .
DEAUMoNT. TEXAS 77704 AREA,dooE     713 838 6631 August 9, 1983 RBG -15,640 File Nos. G9.11, G9.33.4 Mr. Darrell G. Eisenhut, Director Division of Licensing Office of Nuclear Reactor Regulations U. S. Nuclear Regulatory Commission-Washington, D. C.      20555

==Dear Mr. Eisenhut:==

River Bend Station-Units 1 & 2
                                         , Docket Nos. 50-458/50-459 In Gulf States Utilities Company's (GSU) Januarp 6, 1983 letter to your office, a submittal date of August 5. 1983, was establishad for responding to the scope of work required in section 2.1 (Phase 1) of Enclosure 3 to your {{letter dated|date=December 22, 1980|text=December 22, 1980 letter}}, " Request for Additional Information on Control of Heavy Loads." To support the River Bend Station (RBS) fuel load schedule of April, 1985, a Consultant will now be assisting GSU in its control of heavy loads evaluation. Phase 1 is now scheduled to be submitted to your office by February, 1984 Sections 2.2 and 2.3 (Phase 2, of Enclosure 3) to your {{letter dated|date=December 22, 1980|text=December 22, 1980 letter}} is anticipated to be complete by October, 1984.
Sincerely,
                                                                           -W J. E. Booker Manager-Engineering, Nuclear Fuels & Licensing River Bend Nuclear Group JEB/RJK/kt Enclosures

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RBS ESAR QUESTION 410.8 (9.1.4.3)
Provide   a    schedule for  submittal of spent fuel cask drop analysis and the polar crane load drop analysis    or provide
        ,   the analyses.

===RESPONSE===
The sp;nt fuci ;;;h d;ep anal3 ;i; and th; p;1;r cran; leed dr:p :nclyri; _ill b; pr;vided b3 Jun; 1^00.                    l7 REPLACE WITH INSERT Amendment 7               Q&R 9.1-3              February 1983

INSERT (For Page Q&R 9.1-3)
The spent fuel cask drop analysis is provided in revised Section 9.1.4.3. The polar crane load drop analysis will be provided by the end of December, 1983.
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RBS FSAB maintaining an .idequate water level over the open cask for a    cooling and shielding purposes. After decentamination of the cask external surfaces, it is mounted on its transport vehicle        with     its attendent cask cooling systems,          if necessary.       The   loaded  spent   fuel  shipping   cask   is  then
           . ready for shipment offsite.
9.1.4.3      Safety Evaluation, Fuel Handling System safety- aspects (evaluation) of the fuel servicing equipment are discussed in- Secticn 9.1.4.2.3 and safety aspects of the refueling           equipment        are     discussed       throughout Section 9.1.4.2.7.          A    description    of    fuel    transfer, including        appropriate safety features, is provided in                    -1 Section 9.1.4.2.11.           In  additicn, the following summary safety evaluation of the fuel handling system is provided.
The SFCT is designed so that during a seismic event, no part of the trolley system, including main trolley, auxiliary trolley, and auxiliary bridge, leaves its rails or becomes detached. The SFCT is not designed to be operable during or                          ,
after a seismic event. The spent fuel cask drop analysis de was currently being performed to verify that a cask drop does not result in unacceptable damages to the spent fuel storage """"       ...,,,,
facility or safety related equipment.f Octoilcd rccultc of LL 5 onelysis will ic providcd by ; inter c; cad; cat to the
(.)      Teddh The fuel handling accident involving a fully loaded
('       spent fuel cask is addressed in Section 15.7.5.
The fuel building bridge crane is not seismically designed but is provided with seismic restraints to prevent the trolley and bridge from leaving the rails during a seismic event.
The REPC is designed and fabricated so that no component t            becomes detached during a seismic event. The crane bridge arid trolley are designed and fabricated so that they do not
!            leave their rails during a seismic event. The BBPC is not l         '
designed to be operable during or after a seismic event. An analysis was perforned             to    determine    the    structural consequence of dropping the BFV head during maintenance operations.       It was postulated that the vessel head would be dropped frcm a height of approximately 40 ft above the vessel-head flange, and that at impact, the head would be rotated 90 deg from the in-place crientation causing a point impact on the vessel.
i The    vessel        loads due to the postulated impact were determined by dynamic, elastic perfectly-plastic finite element analysis.
9.1-59

4                  INSERT (For Page 9.1-59)~
The following considerations are applied in performing the cask drop analysis:
: 1. The cask is assumed to be a maximum loaded cask with a                                                                                                     !
weight of 125 tons and handled by the main hook.                                                                                                           !
: 2. Each postulated cask drop assumes impact in a manner that inflicts the most severe damage.
: 3. No credit is taken for the spent fuel cask trolley's 3
multiple independent braking systems, limit switches, or other safety features.                                                                                                                                     [
l 4     Drop analyses are based on an elastic-plastic curve that represents a true stress-strain relationship.
: 5. The cask is assumed to be transported at a height of 6 inches above elevation 113'-0" (Fig. 9.1-9).
;                             6. All energy of each postulated drop is assumed to bc
,                                   absorbed by the structure.
: 7. Drops are poululated along the travel path of the cask (Fig. 9.1-9) not restricted by mechanical stops.
!                             8. The cask is assumed to be rigid and not to experience any deformation during impact.
: 9. The cask pool is assumed to be flooded during the cask-handling process. The water level is lowered slightly to avoid spill-over while the cask is being handled in the
!                                   pool. However, this small loss of water does not significantly diminish the drag forces of the cask pool volume.
:                 The cask drop analysis shows that there are no unacceptable effects caused by the free fall of the cask at any point along the path of l                  the main hoist's travel. The evaluation criteria of NUREG-0612, Section 5.1, are satisfied. None of the postulated cask drops result in the release of radioactivity. There is no damage to fuel or fuel j                  storage racks since the SFCT Main Hook Position is fixed at the midpoint between the trolley rails, and thereby prevents the cask
;                  from being handled over the fuel storage pool or its walls. As shown in Fig. 9.1-9, rail stops prevent tra/el of the main hoist over the lower fuel transfer pool or its walls. None of the postulated drops                                                                                                         '
cause damage that result in water leakage from the fuel storage pool. .No damage to safe shutdown equipment or degradation in safe shutdown capability is experienced due to any of the postulated drops. As shown in Fig. 9.1-9 the cask does travel over a pipe tunnel (Position 3) which contains safety-related electric cable and one safety-related pipe. However, analysis of the postulated drop I
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shows that the reinforced concrete member does not collapse or j                                        experience generalized failure. Localized spilling of the concrete may occur, but it will be contained by metal decking and therefore is                                                                                                                     ,
not considered capable of disabling the safety-related pipe or                                                                                                                           i electric cable. The postulated cask drops at Positions 4 and 5 (Fig.
9.1-9) do not result in unacceptable damage to the reinforced concrete member or slab. A cask drop at either of these positions t                                        can be expected to cause localized chaling of the concrete at the impact point; however, analysis shows that structural integrity is maintained and no collapse, structural failure, or breach of the adjacent walls is caused.                                                                                                                                                                 ,
A cask drop in the outside loading area does not result in any unacceptable damage since the cask's fall is onto the rail car or the rail tracks and does not impact any fuel building structural members.
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ENCLOSURE 11 s
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RBS FSAR
: 3. Remotely      actuated valves are provided in the                              C1 .
component cooling water system to isolate the piping which is not safety related from that which is safety related.
: 4. The RPCCW system is designed to provide a closed cooling water loop between potentially radioactive systems and the service water system used for
              , cooling.,
: 5. The RPCCW system is designed as a single unit system and does not share functions, piping, or                              .
equipment with other units.
: 6. System      containment            penetrations and isolation valves are designed to meet Seismic Category I and ASME      Section III,            Class 2      requirements.      The process piping to and from the fuel pool coolers and RHR pump seal coolers, including the component isolation valves,             is designed to meet            Seismic Categcry I       and           ASME         Section III,     Class 3 requirements.          The remainder of the system is designed      to ANSI B31.1,             TEMA,     NEMA,   and ASME Section VIII Codes and Standards as applicable.
The RPCCW system also meets the requirements of                                f 10CFR50, Appendix A, GDC 44, 45, 46, 54,                    and 57; and is designed according to the River Bend Station                            (
positions on Regulatory Guides 1.26, 1.29,                     1.46, and 1.53 as applicable.
: 7. The  safety-related components of the RPCCW system are  located within plant structures which are designed to protect against the effects of adverse external environmental conditions as discussed in 3
i         Sections 3.3, 3.4,             3.5,     and 3.7. p in accition, INSERT A .
Section 3.6 and Appendix 3C address, respectively, the ability of the safety-related' portions of the INSERT B system to withstand the effects offmoderate energy pipe cracks and the resultant internal flooding.
Section 3.11        addresses           the      qualification       of safety-related components                to    specified internal environmental          conditions           such    as     pressure, temperature, humidity, and radiation.
;     9.2.2.2    System Description The system is a closed-loop design and consists of three 50 percent flow cooling water                   pumps,      three    50 percent capacity heat exchangers, one system surge tank, redundant headers in that portion of the system which is shared with Amendment 1                         9.2-6                          October 1981           k

e INSERT A (Page 9.2-6)
Protection is provided from the effects of internally generated missiles as described in Section 3.5.
INSERT B (Page 9.2-6)
...both high energy pipe breaks and ...

RBS FSAP QD TABLE 3.6A-23 (Cont)
          ,    15. Penetration valve leakage control system (3)
: 16. Spent fuel pocl cooling system ( 3) r- 17. Safety related portion of the reactor plant component cooling water system 4+. The following equipment / systems,               or portions thereof,        (ETCCW) 18  required to_ assure the . proper operation of                    those essential items listed in items 1 through +6:                                                -
17
: a. Class IE electrical systems, ac and dc (including                          .-,.
diesel generator         system (3), emergency buses (3),
motor         control        centers (3),       switchgear(3),
batteries (3), and distribution systems)
: b. Standby service water (s) to the following:
(1)   Unit coolers (2)   Pumps coolers (motors and seals)
(3)   Diesel generator jacket coolers g{-                      (4)   Electrical switchgear coolers k     -
: c. Environmental systems (3) (HVAC)
: d. Instrumentation (including post-LOCA monitoring) l (1)The essential items listed in this table are protected in accordance with Section 3.6.1A, consistent with the par-ticular pipe break evaluated.
(2) Refer to Section 6.3 for detailed discussion of emergency core cooling capabilities.
(3) Located outside containment, but listed for completeness
   .               of essential shutdown requirements.
2 of 2
                             -                                    -       - - - -  ---v     v --,u       w-   w %

RBS FSAR
(,                                     TABLE 3.6A-24 ESSENTIAL SYSTEMS / COMPONENTS / EQUIPMENT EVALUATED FOR PIPE FAILURES OUTSIDE CONTAINMENT
: 1. Containment isolation system and containment boundary
: 2. Rea.ctor protection system (SCRAM signals)
                                  ~
: 3. Emergency core and containment cooling systems                                         .
: a. HPCS or RCIC                                                                  _
: b. One LPCI or LPCS
: c. RHR shutdown cooling mode (one loop)
: d. RHR suppression pool cooling mode (one loop)
: 4. Flow restrictors
: 5. Main control room habitability system
: 6. Spent fuel pool cooling system
: 7. Standby gas treatment system
: 8. Safety related portion of the reactor plant component cooling water system (RPCCW) f:w   9 4*. The following equipment / systems, or portions thereof, (E           are required to assure the proper operation of those essential items listed in items 1 through 47 8
: a. Class 1E electrical systems, ac and dc (including diesel generator system, emergency buses, motor control centers, switchgear, batteries, auxiliary shutdown control panel, and distribution systems)
: b. Standby service water to the following:
(1)   Unit coolers (2)   Pump coolers (motors and seals)
(3)   Diesel generator jacket coolers (4)   Electrical switchgear coolers l
l                c. Environmental system (HVAC)
: d. Instrumentation (including post-accident
!                      monitoring)
NOTE: The essential items listed in this table are protected l
in accordance with Section 3.6A.1, consistent with the l                   particular pipe break evaluated.
       ;.                                       1 of 1

ENCLOSURE 12 i
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RBS FSAR
: j. Reactor protection system (RPS)
: k. All containment isolation valves
: l. HVAC     systems required during operation of the previous items
: m. Electrical systems and control systems and instruments required for operation of safety-
          =   n. Sa[gk*fg 0 E
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cooling      -
: 4. No     offsite         exposure     exceeding      the      limits     of 10CFR100.                                                                  -1
: 5. No loss of integrity of the spent fuel pool.
: 6. Although Class 1E sensors to the (RPS) are located on the turbine control valve (Tcv) and stop valve, failure of these sensors does not prevent the reactor from being safely shut down since other RPS sensors      (high-pressure scram or high-flux scram) located       in      safety-related        buildings          provide sufficient backup.             Therefore,      these sensors are not analyzed for missile hazards inside the turbine
     .         building.
Essential structures, systems, and components are protected from the effects of internal missiles by one or more of the following practices:
: 1. Locating the system or component in an individual missile-proof structure
: 2. Physically           separating       redundant       systems         or i         components        of     the   system      from      the       missile trajectory path
: 3. Providing localized protective shields or barriers for systems and components
: 4. Designing         the      particular      structure        or local protective shield / barrier to withstand the impact of the most damaging missile
: 5. Providing design features on the potential missile source to minimize the probability of missile generation 3.5-2                                              k

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demineralized water services are as follows:
3r                                               ,
l Turbine plant component cooling water system Turbine generator stator cooling unit                                                                                                                                                    ,
l Reactor plant component cooling water system                                                                                                                                  ,
: r. -
control building chilled water system                                                                                                                 ,                                  -        ".
Ventilation chilled water system                                                                                                                                                                                                 -
Auxiliary boiler makeup                                                                                                                                                                                     '1 i
INSERT A                                                     -
Laboratories, decontamination areas, and sample sinks.
Nh:                          ::nt:;l                           building chilled                                                         :ter cyct:: i -th: Only
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                                              ;;rvic                                                 ;;tcr         ;y;tc;.                                Lc;ksgc during h;th normal and 20            id:nt :: ditic : : 10 rc lt f;;; 10 h: i                                                                                                                             fitting: Or
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                                              ;yet;; i; c;timat;d at 5 gpd. Alth;rgh d: incr:lized ::ter g{3                        is rcquir:d f;; n r;;l ;;kcup t; th; ;;;;t:r pl:nt :::penent c;; ling r;ter cyctc;,                                                                                n;         dc;incr:li;;d                           ;;ter                              ;;h: p 10
              . _' o                 ~
:: quired during ;;;id:nt ;;nditi;n: 'Ocction 0 .2. 2) .                                                                                                                                              c_sa i                                             When                               the exchange capacity of either the cation exchange unit, the anion exchange unit, or the mixed bed exchange unit in a train becomes exhausted, the train is removed from
,                                             service. The exhausted units are regenerated with solutions                                                                                                                                                            l ,.,
of dilute acid or dilute caustic or both as required. The                                                                                                                                                               e.             -
,                                             cation and anion exchange unit pair is normally regenerated                                                                                                                                                                       J.,
l                                             Sn the same sequence, even if only one is exhausted.                                                                                                                                                       ._
                                               -                                                                                                                                                                                                                                      ^ ^
                                                                                                                                                 .3                  . .-                  ? -
                                                                                                                                                                                                            .                                  ..       .v Dilute acid and dilute caustic are prepared by the in-line dilution of concentrated sulfuric acid and concentrated liquid caustic, which are pumped from their respective measuring tanks, with demineralized water.
                                                            .                                                  .                                                                                     ,                                                         +
A             caustic dilution water heater maintains the caustic dilution water at a temperature sufficient to produce -a caustic solution temperature of approximately 1200F. This                                                                                                                                                                                   '
ensures regeneration efficiency for the anion resin by enhancing silica elution.                                                                                           The measuring tanks are filled periodically from the acid and caustic bulk storage tanks.
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INSERT A (For Page 9.2-15)
Standby Diesel Generators Condenser Air Removal Pumps Discharge separators Condensate Makeup and Drawoff System (to Condenser Hotwell) l l
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(

RBS FSAR cx 55y~
into the' cooling tower blowdown line for ultimate discharge to the Mississippi River.
9.2.3.3    Safety Evaluation The two 350,000-gallon demineralized water storage tanks provide sufficient capacity to                          ensure           a    supply     of        S demineralized water to meet station requirements.
    ~
                              ' Conductivity        is      continuously monitored at the effluent'of                         'E each demineralizer exchange unit. High conductivity alarms                                      -
are provided on the makeup demineralizer control panel in
                                .the auxiliary control room to alert the station operators to                                  -?
an abnormal condition.                  Silica analyzers are provided for                          ,',-
each train of demineralizers to alert the operator of silica                                                 ;
breakthrough.          Operator action is then taken to correct the                                          i situation and to minimize the amount of contaminated fluid                                                   -
being distributed throughout the station, including the control building chilled water system.-                        The makeup water requirement of the chilled water system is low (estimated at 5 gpd) when compared to the total volume in the system (1,100 gall'ons) .           Consequently,            small amounts of fluid exceeding makeup water                  conductivity           limits           are     not
_ detrimental to the operation of the chilled water system.
s           .                                                                             2:            INSERT C
           ' ?;g                9.2.3.4    Testing and Inspection Requirements The demineralized water makeup system is an operational system which is expected to be in daily use and as such does not require periodic testing to ensure operability.                                 During periods of low makeup requirements, standby equipment can be placed in a recycle mode and monitored to ensure acceptable                                  ,
                              . quality and availability.                                                                    ..-
2During startup, various                   inspections and performance tests                             -
are made to ensure that                the system meets                    specification        -
requirements.
                               ' Grab samples are periodically tested in the laboratory to verify demineralizer performance and to ascertain stored water quality.
9.2.3.5     Instrumentation Requirements Control       panels located in the auxiliary control room accommodate instruments and controls for operation of the makeup water system, makeup water treatment system, and l                               waste water treatment system.
Amendment 9                              9.2-17                                July 1983
          @9.y
                                                                                                                           ~
l      -
i l                      _

INSERT B (For Page 9.2-17)
The makeup water system is not required for safe shutdown of the plant or to support the operation of engineered safety feature systems.
Demineralized makeup water is not regt>1 red for operation of the control building chilled water system, reactor plant component cooling water system, or the standby or HPCS diesel generators during accident conditions. Abnormal and accident conditions for these systems are discussed in Sections 9.2.10, 9.2.2 and 9.5.5 respectively.

INSERT C (For Page 9.2-17)
The entry of radioactive water into the makeup water system is not likely to occur because, with the exception of the condensate makeup and drawoff system, all other interconnecting systems do not normally contain radioactivity and the makeup water system is normally at a higher pressure.
,         The makeup water system is protected against the intrusion of low level radioactive water from the condensate makeup and drawoff system by the 'ollowing:
: a. The makeup water connection to the condensate storage tank is located one foot above the tank overflow and therefore radioactive contamination is not possible. This connection is an open nozzle, with no piping en the inside of the tank,
: b. The makeup water connection to the condensate makeup and drawoff-system is used for filling the condenser hotwell during maintenance. This connection is normally closed with a locked closed gate valve and check valve.
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RBS ESAR The condensate storage tank normally supplies the HPCS and RCIC systems.      However,     automatic shutoff       valves    are provided to     close  on low   condensate    storage tank  level and transfer HPCS and RCIC pump suctions to the suppression pool, which is the pr,imary safety design source of core Japray water.
The level instruments, together with their power supplies, transmitters, readout equipment, etc, that provide this transfer signal are safety related. The level instruments
* are connected to the safety-related suction piping leading to the HPCS and RCIC pumps,              and are physically located
                . within a Seismic Catagory I structure.
That portion     of   the condensate makeup and drawoff system                      -
which penetrates the containment and forms part of the containment boundary (Fig. 6.2-65) is Safety Class 2 and Seismic Category I (Table 3.2-1).
Failure     of the condensate storage tank during normal operation would not result in the loss of water supply for                               !
the control rod drive hydraulic system since the normal CRD system supply is from the condensate system pump discharge.
                                                                                        .m--       INSERT Failure of the condensate           storage    tank during accident FEE" f              conditions would not preclude plant safe shutdown or post-accident mitigation processes, The systems which draw water from this tank are all capable of performing their safety
                  . function without this water supply. Specifically, the HPCS
;                       and RCIC suction would          automatically      shift    to   the suppression pool; the CRD accumulators provide enough stored
 ;                      energy to insert control rods; and the fuel pool cooling
__                 system receives any required makeup water from the standby service water system.
,                       Level in the condensate storage tank is normally maintained by the demineralized water transfer pumps.            Should these pumps fail, level can be maintained directly from the makeup j                       demineralizer forwarding pumps.
j Continuous level monitoring of the condensate storage tank provides practical assurance that leakage does not go undetected or uncontrolled and meets the requirements of
: General Design Criterion 60. Tank overflow and drains             are retained by the sump.        Water   collecting  within  the sump   is pumped to the radioactive liquid waste treatment system by a sump pump. The overflow system is designed for the maximum l
influent from the largest single source. The tank vent is provided with a screen to prevent the entry of birds or
{
Amendment 2                       9.2-35              February 1982                      ;

                     - INSERT'A (For Page 9.2-35)
The catastrophic failure of the condensate storage tank (CST) does not flood any safety related equipment. Figure 9.2-25 shows the finish plant grading in the area of the CST, and the approximate area that would be covered by 6 inches of water from CST failure; ie, to an elevation of 95'-0". Since the ground is relatively level, water from CST failure spreads out over a wide area. Exterior openings located closest to the CST are an access door at el. 98'-0" and a truck door at el. 94.75', both in the north wall of the fuel building. These doors are designed to be watertight. In addition, the design of safety related structures is based on a probable maximum flood level of 98'-0" msl. Flood protection of the plant is further discussed in Section 3.4.
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i RBS FSAR 1
l QUESTION 410.51 (9.3.1)
>     The     Penetration      Valve     Leakage      Control System (FSAR Section 9.3.6), which supplies compressed air to the safety-related compressed air system (SRCAS), does not contain air dryers and after-filters. Discuss how you will meet the requirements of ANSI MC 11.1-1976 for air quality as stated in     Section 9.3.1       of     the      Standard        Review               Plan (Paragraph III.2) for the compressed air supplied to the SRCAS..             .

===RESPONSE===
The     penetration      valve leakage control system (PVLCS) supplies air to three safety-related systems: the PVLCS, the main steam-positive leakage control system (MS-PLCS), and the main steam safety and relief valve system.
The response to this request for compressed air supplied to the main steam safety and relief valve system is provided in revised Section 5.2.2.4.1. This system meets ANSI MC 11.1-1976.
The PVLCS and MS-PLCS use air to pressurize valve bodies and pipes in various fluid              systems     that      penetrate              the containment.       The air does not flow through small passages (such as solenoid valves) or equipment with small operating clearances (such as air operated pistons and cylinders);
therefore,F tk 5 -.icron inlct filtcr On th                c c = ,r r : C C o r   12      {f 2dequ2tc.       Since most of the pipes and valve bodies to be pressurized are initially filled with water,                     air dryers would serve no purpose and are not provided.
3-micron filtration is not necessary.
          - The compressors are water seal units which by their design have no oil contamination. There also are no hazardous or corrosive vapors. The requirements of ANSI MC 11.1-1976 are not applicable to the PVLCS and MS-PLCS air systems since they are service air applications, not instrument air.
Amendment 2                   Q&R 9.3-6                      February 1982               ,
(+

RBS FSAR one    ADS      valve can fulfill longer term needs.                                  Each             ~
accumulator is instrumented to provide the reactor operator with indication of an air supply problem.
3        The air supply to the ADS valves has been designed such that the failure of any one componenet does not result in the loss of air supply to more than one nuclear safety-related division of ADS valves. The loss of air supply to one division of ADS' valves does'not prevent the safe shutdown of
          'the unit.           -
SP" cnd ADS pneurctic 2ccumulctere ere suppliad                                "4+k    oir frer the p:nctration /cl/c lcchc;c centrcl cyctor                                          REPL!CE
                                                                                           'PVLCS). 97,Df r 2      The cir frcr th: PVLCS ic dricd tc __M_,_                         dc;; cint of 0 F ct INSERT.
           ,mm          -,       ,_                                                                ,,
                              .~ mm mu
                                       ,  m _      - . . _ _ _ , _ _ _ _ _
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O micrunc.       Ecfcr tc Ccction 0.0.C for a dcccription of thc r"LCC.
Each SRV discharges steam through a discharge line to a point below the minimum water level in the suppression pool.
The SRV discharge . lines are classified as Safety Class 3 and Seismic Category I.        SRV discharge line piping from the SRV to the suppression pool consists of two parts. The first is attached at one end to the SRV and attached at its other end to a pipe anchor.        The main steam piping, including the SRV discharge piping up to and including the first anchor,                                  is analyzed as a complete system.                           Diameter,        length,      and i
routing of the SRV piping              are given in                      Appendix 6A,
        ,  Table A.6A.4-1 and Fig. A.6A.10-1 and A.6A.10-2.
The second part of the SRV discharge piping extends from the anchor to the suppression pool.                Because             of the upstream anchor on this part of the line, it is physically decoupled                                   -
from the main steam header and is therefore analyzed as a separate piping system.
The effect of the alternate shutdown cooling mode on SRV discharge piping has been considered.                           The resultant load 7          distribution is within the design capacity of the spring hangers and othar support structures.
As a part of the preoperational and startup testing of the main steam lines, movement of the SRV discharge                            lines will be monitored.
The SRV discharge piping is designed to limit valve outlet pressure to 40 percent of maximum valve inlet pressure with the valve wide open. Water in the line more than a few feet above suppression pool water level would cause excessive pressure at the valve discharge when the valve is again Amendment 7                       5.2-13a                               February 1983              (

INSERT (For Page 5.2-13a)
During normal plant operation, SRV and ADS accumulators are supplied with air from the SVV air compressors. These NNS compressors provide 17 SCFM at 175 psig. Post-LOCA air requirements are supplied from the Penetration Valve Leakage Control System (PVLCS). Refer to Section 9.3.6 for a description of the PVLCS.
Air from either source is dried to a dew point of -40*F at 140 psig and filtered to a maximum particle size of 1 micon. The NNS air dryer and filters have a safety Class 2 bypass line and isolation valves to ensure air is provided for the ADS function in the event the dryer / filter become inoperable or plugged. A safety Class 2 pressure transmitter which activates an annunciator in the control room is provided downstream of the dryers to alert the operator to a malfunction and allow him to remote manually isolate and bypass the dryer / filter. Pressure transmitters are also provided on the PVLC' air accumulators as described in Section 9.3.6.
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RBS FSAR of the MSIV beyond the capacity                                             or                   capability                           of the MS-PLCS.
: 12. Equipment is provided (as part of the MS-PLCS) to prevent the release of valve stem packing leakage to       the     environment                                       from    MSIVs outside the containment.
6.7.2         System Description 1
6.7.2.1          General Cescription The source of air for the MS-PLCS is the penetration valve                                                                                                ~-
leakage control system (PVLCS) air compressors, one for the outboard system and one for the inboard system. Each air compressor is a nuclear safety-related air supply source for the MS-PLCS, the PVLCS and the main steam safety / relief valve system.                  Each compressor                                        assembly                         contains                        an accumulator which is sized to accommodate the initial post-accident requirements of the three above listed systems with the long term . requirements being met with the function of the air compressor. The air compressors are equipped for water cooling and are designed to run ccntinuously for 30 days after an accident.                                    The design temperature and
        .             pressure             for the compresscr assemblies are 1500F and
                   ~200 psig, respectively.                         Each compressor assembly delivers 70 4Hr scfm of air at an operating pressure of N9& psig. Refer
;                     to Section 9.3.6 for a complete description of the PVLCS.
120 Two        independent systems (outboard and inboard) are provided to accomplish the leakage control function.                                                                                  The leakage control barrier is established by pressurizing the isolated
;                     volumes in the main steam line between the inboard and outboard isolation valves and the main steam shutoff valves.
                   .The pressurized volume eliminates out-leakage through the c1csed MSIVs and main steam drain lines such that any leakage which does occur is inward from the pressurized volume           into       the     reactor                           pressure                  vessel                                          (RPV)  or containment. Both systems are connected to the offsite as well as onsite emergency power.
The MS-PLCS is shown in Fig. 6.7-1 and 6.7-2. The outboard system is connected to each of the main steam shutoff valves,            drain lines                (inboard and outboard MSIV), and outboard MSIV stem packing leak-off lines.                                                                                  The inboard system is connected to the outboard MSIV body (inlet side) ,
and to the inboard MSIV drain lines located outside the centainment.
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RBS FSAB
  . .,a f"                        1. Main Steam Isolation Valves on loss of air supply, the main steam isolation valves fail closed. A main steam air accumulator is   located near each isolation valve to provide pneumatic pressure for the purpose of assisting in valve closure in the event of failure of pneumatic              ;
supply pressure to the valve operator system.       In addition, three parallel strainers are located inline to ensure air cleanness        (<50 micron) by         ,
filtering particles from the air to the MSIVs.
: 2. M2in Ctc;; C;fcty/Cclicf Valves                          't Each     0;fcty/rclicf    valvc 10 prcvided with a pacusatic ecomaulete. which provides sufficient capacity, an the e. cut of loss of eir supply, te cncurc ;dcquet; supply pcc;;;cc tc the           valvc actuator. Zach safety / relief velve ssed fer ADS feuvi ee is pie 4.ded with an additional accumulator which pre.idcs air Ic;crvc aargin, cu the less of si; su y ply for cycling of the velves. The function of th; A00 valves is discussed in Ccctieu 7.3.1.          .
2 -&f Scram Valves On   loss of air supply, spring action and system pressure force the scram valves to fail open causing control red drive water to force the piston upward, inserting the contrcl rods.
3 ,W. Scram Volume Vent and Drain Valves                     .
On   loss of air supply, spring action forces the i                scram vent and drain valves to fail closed to               -
prevent loss of reactor water discharged from all the scram valve drivers during a scram, and also to contain the reactor       water  that leaks past the
          .                    drivers following a scram.
4 Jr. Besidual Heat Removal System Three     testable   check valves lose their test capability on loss of air, with no effect on the system.
a ::8 9.3-5

BBS FSAB SJK     Feedwater Check valves outside the Containment Wall On   loss of air supply, spring action forces the feedwater check valve off its back seat, allowing it to float with system flow.
The consequences of compressed air system active component failures are presented in the Failure Modes and Effects Analysis (FMEA) , Report.
9.3.1.4    Testing and Inspection Bequirements
                                                                         ^
The instrument and service air systems operate continuously and are observed and maintained during normal operation. No special inspection and testing are required following pre-operational testing.      The breathing air system portable purification units are tested periodically for human use in accordance with normal unit operating procedures.
9.3.1.5    Instrumentation Requirements 9.3.1.5.1    Air Compressors Manual control switches are provided in the main control room for operation of the air compressors.
Control logic is      provided so that a          low   air receiver pressure condition    automatically starts        the   standby air compressor.
4   Loading and unloading of the compressors are accomplished by automatic ccntrols. A pneumatic unloader allows the air compressor to start unloaded.
compressor   trouble alarm is provided in the main control room. The air compressor stops if an extreme                abnormal condition occurs.
T'he pressure of the cooling water for the air compressors is maintained at its setpoint by       modulating    a   valve  in  the TPccw supply line.
9.3.1.5.2       Instrument Air System Operation of the drying and purging cycle for the instrument air dryers is controlled by a cycle timer in conjunction with a four-way valve operator.              Automatic controls are provided for operation of the instrument air dryer heaters during the dryer purge cycle.              A dryer trouble alarm is provided in the main control room.
9.3-6                                    -

RBS FSAR and outboard PVLCSs is functioning properly. The pressure barrier is maintained at a pressure at least 10 percent higher than the peak calculated drywell pressure. Thus, only inleakage of nonradioactive air into the containment is possible past the valves, and no post-LCCA containment atmosphere is discharged thrcugh the pressurized valves.
The effect on peak containment pressure due tc air inleakage is insignificant over a 30-day post-accident period.
9.3.6.2.2   Detailed Descripticn                                            .
The inboard and outboard systems are the same, and similar            ,,
to the MS-PICS in design and operation.
Each PVLCS consists of the follcwing components as shown on Fig. 9.3-13a and 9.3-13b.
Component                Description Inlet filter             Filters the air coming from the auxiliary      building      atmosphere, removing all particles larger than 5 microns 70                    120 (U Air compressor           Delivers M scfm of air at $99 psig
(~                          operating pressure. It is equipped for     water      cooling     and     runs continuously after       an      accident, providing a nuclear safety-related air supply for the          PVLCS,      the MS-PLCS,      and    the    main      steam safety / relief valve system,        It is sized    to    accommodate the above
_                      systems. The    maximum      allowable       '
leakage rates for the PVLCS process line    valves      are     listed       in Table 9.3-3.
T.ftcrcccic              Occic    the     cir Icczing      the   cir-
:::prcccc: t      :C""
Mcicturc ccpcrctor       nc;cvcc wcter d:cpictc which havc condcnccd i.- thc cftcrcoolcr-120 Air accumulator          Stores sufficient air at &&O psig to fill the piping and valve              body volumes being sealed.
Downstream    of the accumulator are two branch lines, one to the MS-PLCS 9.3-33

4 4
RBS FSAR
                                                                                                                                                                                            'I          l per two                  injection line). Higher pressure injection lines have            two      check valves- in series.                                                         The high                         pressure i                          feedwater                injection             header     also                has       two                    isolation                 valves    in
                       . series.            The      outboard           system          is           equivalent                                      to       the    inboard system.
The           MS-PLCS injection valves remain closed and do not place any demands on the PVLCS air compressors.                                                                                   However, the main         may steam safety / relief valves' associated accumulatorsVdraw air from the EVLCS accumulators Le a;%;                                                                                  as fez                leakag;;                    .
Pressure transmitters maintain the EVLCS accumulators at a predetermined set point, at which the accumulators maintain                                                                                                 ,
enough_ air'to meet all short-term requirements of the PVLCS, the MS-PLCS, and the main steam safety / relief valve                                                                                        system.
An automatic start is provided for the air compressors to recharge the accumulatcrs above the minimum set point as determined by the pressure transmitters.
Lir taeir aseec1etea 9.3.6.3.2                Cesign Easis Operation                                                                             SVV compressors are unavailable.
Approximately 20 min after it has been ascertained that a LOCA has cccurred, the PVLCS is actuated. The 20-min time period prevents the standby power supplies from being overloaded due to the starting current drawn by the PVLCS air compressors and motor-operated valves, adding to the                                                                                                            ;,
starting current of other safety-related items. The 20-min
                                                                                                                                                                                               ~
l                            time period also serves as sufficient time for the reactor
>                            vessel pressure to decay to a pressure at which                                                                                        the    PVLCS can function. The air line pressure at the injection point to the process line valves is 1.1 times that of the                                                                                         reactor
;                            drywell pressure.                             In  addition,                         the                          leakage               of   fission products during the 20-min period is insignificant with
>                            respect to 10CFR100 guidelines.
                           'Upon            initiation,                  the injection valves and isolation valves must        be manually opened (remote manual initiating switch) .
The          valves have interlocks that prevent leakage of any process line fluid upstream of the valves (Section 9.3.6. 5) .
If,          5 min after initiation,                                       high flow or low pressure is detected in one system, that system automatically isolates and the other system provides the seal. High flow and low pressure indicate that the process line valve is stuck open or partially open, or the system no longer maintains system integrity. Low pressure (sensed downstream of the isolation valve) by itself indicates that an injection                                                                                              valve or isolation valve has failed to open, or that the compressor is not operating correctly. The compressor is equipped with suitable instrumentation to detect and annunciate                                                                                     failures.
9.3-36                                                                                                 '
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ENCLOSURE 16 l
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W RBS FSAR Local        analyzers      are    provided         where   insertion-type                     'h conductivity cells,, immersion-type pH electrodes, or local                                          )
turbidity detectors are required.                                                                    '
Recorders and alarms are provided for the process sampling system in both the main and auxiliary control rooms.
9.3.3    Equipment and Floor Drainage Systems.
The equipment drainage systems are schematically shown in Fig. 9.3-6a through 9.3-6e and 9.3-7a through 9.3-7j for the turbine building and reactor building, respectively.
The   fleer      drain 2;e   eyctc : cre cchc= tically chcun in Fig. 0. 3 - 3   thrcegh 0.3 Sf, 0.2 10, 0.3 11; through 0.3 tia,                     REPIACE Ond   0.3-12 fOr th0 rO20 tor building, fuCl building, turbinO                       WITH building, and Indu;;t; huildingC, 200pcctivcly'.                                      INSERT A 9.3.3.1      Design Bases The design bases of equipment drainage systems are:
: 1.      Sumps for the collection of equipment drainage are located in the turbine building, reactor building, and fuel building. Influent to these sumps is non-oily     waste     from      radioactive,           potentially                     O radioactive,     and  nonradioactive       sources   (excluding all types of floor drainage) , such as:
: a. Pump casings
: b. Air conditioning condensate drains
: c. Valve stern leakcffs
: d. Relief valves
: e. Other similar equipment.
i
: 2.      Contamination of equipment drainage with floor
;              surface drainage is prevented by                  having     the l              equipment     drainage  sump   covers     located   on  elevated concrete curbs and          by    terminating          equipment drainage piping in raised-rim hubs.
: 3.      Equipment drainage sump pumps discharge effluent to the   condenser hotwell for reuse in the steam generation system. A conductivity eleinent located in the discharge         piping         header    continuously monitors       the     effluent          conductivity      level 4%
9.3-12

INSERT A (For Page_9.3-12)
The floor drainage' systems are schematically shown in the following figures:
Reactor building                                                                ' Fig. 9.3-8a through 9.3-8f
_ Fuel building                                                                       Fig. 9.3-10 Turbine building                                                                    Fig.            9.3-11a through 9.3-11e Radwaste building-                                                                 Fig.            9.3-12 Piping tunnels                                                                     Fig.            9.3-16
             . Services building                                                                   Fig.            9.3-17 Control building                                                                    Fig.            9.3-18 Electrical tunnels                                                                 Fig.            9.3-19                                               ,
Makeup water pump house                                                             Fig.            9.3-20                                               l l
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i RBS FSAB Area 9.3.3.5.7    condensate Demineralizer/Off Gas Stilding Floor Drains Thic inf0r=; tic: Cill 50 providCd in a futura a; cad;cnt. INSERT B 9.3.3.5.8    Piping Tunnel Floor Drains This inf;;;; tion will 50 previded in a futurc a; cad;;nt. INSERT B 9.3.3.5.9    Services Building Floor Drains Thia    nfGimation will to provided in a futurc a; cad;cnt. INSERT B 9.3.3.5.10    Control Building Floor Drains This information will te previded in & f u t u r e s eie u d m e u t . INSERT B 9.3.3.5.11    Electrical Tunnels Floor Drains This information Will be PIGvided in a fUturc emendacnt. INSERT B 9.3.3.5.12    Makeup Water Pump House Floor Drains Thic inf0r;; tion will bc provided in a feidie emendmuni. INSERT B 9.3.4    Chemical and Volume Control System Does not apply.
9.3.5    Standby Liquid Control System 9.3.5.1    Design Bases                                                              ,
l           The     standby    liquid           control   system        (SLCS)      has     a l
safety-related function and is designed as a                            seismic Category I system.               It meets the following safety design bases:
: 1. Backup      capability         for   reactivity control is provided, independent of normal reactivity :ontrcl provisions in the nuclear reactor, to be able to shut down the reactor if the normal control ever becomes inoperative.
t
: 2. The backup system has the capacity for controlling the reactivity difference between the steady-state rated operating condition of the reactor with voids l
and the cold shutdown condition, including shutdown frcm the most reactive condition at any time in
  !$3                  core life.
(W                                              9.3-21

INSERT B (For Page 9.3-21) 9.3.3.5.7      Condensate Demineralizer/Off Gas Area Floor Drains Level controls are provided for the condensate demineralizer and offgas area floor drain sump (TK7) to automatically start and stop the sump pumps (P7A, B). A mechanical alternator is provided for selecting the lead and standby pumps. Both pumps operate on a high-high water level. Local control switches are provided for either automatic or manual operation of the condensate, demineralizer and offgas area floor drain sump pumps. Extreme high or low water i
level activates a condensate demineralizer and offgas area floor drain sump level alarm in the auxiliary control room.
i        9.3.3.5.8      Piping Tunnel Floor Drains Level controls are provided for the piping tunnel floor drain sumps (TK7; TK8; TK9; and TK11)           to automatically start and stop the sump pumps (P7; P8; P9; and Pll). Local control switches are provided for either automatic or manual operation of the piping tunnel floor drain sump pumps. An extreme high or low water level activates a piping tunnel sump level alarm in the auxiliary control room.
9.3.3.5.9      Services Building Floor Drains Level controls are provided for the services building floor drain sump (TK6) to automatically start and stop the sump pumpe (P6A, B).
A mechanical alternator is provided for selecting the lead and standby pumps. Both pumps operate on high-high water level. Local i        control switches are provided for either automatic or manual operation of the services building floor drain sump pumps. Extreme high or low water level activates a services building floor drain sump level alarm in the auxiliary control room.
9.3.3.5.10      Control building floor drains l
Level controls are provided for the control building floor drain sump (TK4) to automatically start and stop the sump pumps (P4A, B). A
* mechanical alternator is provided for selecting the lead and standby pumps. Both pumps operate on high-high water levcl. Local control switches are provided for either automatic or manual operation of the control building floor drain sump pumps. Extreme high or low water level activates a control building floor drain sump level alarm in the auxiliary control room.
9.3.3.5.11      Electrical tunnels floor drains Level controls are provided for the electrical tunnel floor drain sumps (TK1; TK2; and TK3) to automatically start and stop the sump pumps (P1; P2 and P3). Local control switches are provided for either automatic or manual operation of the electrical tunnel floor drain sump pumps. An extreme high or low water level activates an electrical tunnel floor drain sump level alarm in the auxiliary control room.
I

                                    -__               _                                    .m    . . . _ - . _. ..                         _                             . .__               __ _--__.
9.3.3.5.12                        Makeup water pump house floor drains 9
Level controls are provided for the makeup water pump house floor drain sump (TK5) to automatically start and stop the sump pumps (P5A, B). A mechanical alternator is provided for selecting the lead and standby numps. Both pumps operate on a high-high water level.
Local control switches are provided for either automatic or manual operation of the makeup water pump house floor drain sump pumps. An extreme high or low water level activates a makeup water pump house floor drain sump level alarm in the auxiliary control room.
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ENCLOSURE 17
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RBS FSAR unit started so that the service time of both units is approximately equal.       In the event the operating unit fails,                       (
the standby unit starts automatically.
The response of the main control room habitability system to airborne radioactivity from outside air intake is automatic.
On receipt of a high radiation signal, air flow is diverted through the emergency charcoal filtration unit, and kitchen and toilet exhaust fans are shut down.
7 I   6.4.4    Design Evaluation                                                                    -
6.4.4.1    Radiological Protection Under normal plant conditions, outside air enters the main control room through the local outside air intake located on the     roof     of the control buildings.                During accident conditions, fresh air may be drawn in through the remote air intake.      Unit 2 can also use the Unit 1 local intake as its remote     air     intake    as          described     in    Section 9.4.1.
Measurements taken from              the    radiation   monitor          in the air supply duct allow operators to select the least                       radioactive air intake.        During a LOCA the outside air supply is automatically diverted through the main                      control             room charcoal filter as a precaution regardless of outside air quality.      All habitability systems are designed to meet the                         (?
single-failure criterion.                                                               (
6.4.4.2    Toxic Gas Protection The effects on main control room habitability resulting from postulated releases of offsite toxic chemicals,                           including chlorine       and    ammonia,        are discussed in Section 2.2.
Consideration of the human odor detection threshold is appropriate since the time difference between detection and incapacitation is equal to or greater than 120 sec.
            . The main control room operators are provided with self-contained breathing apparatus for protection in the event of 7      a toxic gas release. Each operator is taught to distinguish                                .
the odor of chlorine and ammonia and practico drills are conducted to ensure that each operator can don breathing apparatus within 2 minutes.               The main control room air intake header can be             manually isolated in the event of a toxic gas release.
The protection of main control room operators and analysis of hazardous chemicals, as discussed in Section 2.2,                         is in compliance      with    the        guidance outlined in Regulatory Guide 1.78.
INSERT A                  m Amendment 7                         6.4-12                   February 1983
(

INSERT A (For Page 6.4-12) 6.4.4,3  Compliance with Regulatory Guide 1.52 AdetaileddescriptionofcompliancewithpositionsC.2.athrough C.2.f and C.2.k of Regulatory Guide 1.52 is provided as follows:
C.2.a The ESF atmosphere cleanup systems for the main control room is redundant and consist of the following components:    (1) demister, (2) electric heater, (3) prefilters, (4) HEPA filters, (5) iodine adsorber (impregnated activated carbon), (6) HEPA filters.
C.2.b The redundant ES" atmosphere cleanup system filtration units in the control building are physically separated by one foot thick reinforced concrete wall at the fans location,                        i
                                                                          }
C.2.c All components of the control building ESF atmosphere cleanup system are designated as Seismic Category I.
C.2.d The control building ESF atmosphere cleanup system is not subjected to pressure surges.
C.2.e The effects of radiation are considered for all organic-containing materials that are necessary for operation during a postulated DBA.
C.2.f The volumetric air flow rate 3through a single cleanup unit for the       ,
main control room is 4000 ft / min. The filter layout for the main control room is two HEPA filters high and two wide.
C.2.k Outdoor air intake openings are equipped with louvers and bird screens.

i RBS FSAR                                                  ,
: c.      Redundant isolation dampers in the supply air system.                                                  -               ()*'
: 6. The design features (Section 9.4.2.2) incorporated in the fuel building ventilation system minimizes moisture (and, thus, airborne radioactivity)
.                                              propagation in the fuel building environment.
7.-  The consequences of fuel building ventilation system active component failures are presented in the Failure Modes and Effects Analysis (FMEA) i Report submitted under separate cover.                                                 ,
.                                         8. The fuel building is maintained at a negative i                                              pressure of 0.25 in W.G. relative to outside during all modes of plant operation, thereby minimizing
;                                              any possibility of leakage of unfiltered
;                                              contaminated air to the environment.
i
: 9. The physical layout of nonessential portions of the fuel building ventilation system and of other systems in the fuel building not designed to Seismic Category I requirements is such that failure of any nonessential component does not affect operation of the essential safety-related portions of the system.
: 10. Two 100-percent capacity supply and exhaust fans
;                                              are provided for reliable continuous normal operation.
INSERT B                                 ;
9.4.2.4           Inspection and Testing Requirements To ensure and demonstrate the capability of the fuel
!                            building ventilation system, the system components and equipment are subjected to preoperational testing in accordance with the procedures described in Chapter 14.
,                            Local. display and/or indicating devices are provided for surveillance of vital parameters such as room temperature and buildup differential pressure. All system ductwork is subjected to leak tests during erection and is balanced in accordance with the procedures of the Associated Air Balance s l Control Council ( AABC) t s )                ,
The inservice inspection and testing is done in accordance with the procedures described in the Technical Specifications (Chapter 16).
Amendment 5                              9.4-20                                       August 1982 (fi

                           .- -                --        - _ _ . . _ = _   . - _ _ . -          _             . _ . = - - . _ - . . - . . . . .. .. -
I
;                . INSERT B (For Page 0.4-20)
A detailed description of compliance with positions C.2.a through
!                  C.2.f and C.2.k of Regulatory Guide 1.52 is provided as follows:
C.2.a The ESF atmosphere cleanup system for the fuel building is redundant and consist of the following components:                                 (1) demister, (2) electric heater, (3) prefilters, (4) HEPA filters, (5) iodine adsorber (impregnated activated carbon), (6) HEPA filters.
C.2.b
}                  The redundant ESP atmosphere cleanup system filtration units in the fuel building are located in different cubicles separated by a 1 foot thick reinforced concrete wall.
C.2.c All components of the fuel building ESF atmosphere cleanup system are designated as Seismic Category I.
C.2.d The fuel building ESF atmosphere cleanup system is not subjected to pressure surges.
C.2.e The effects of radiation are considered for all organic-containing materials that are necessary for operation during a postulated DBA.
C.2.f
;                                                                  e through a single cleanup unit for the i
Thevolumetricairflowrag/
fuel building is 10,000 ft min                       . The filter layout for a fuel building cleanup train is three HEPA filters high and three wide.
C.2.k 4
Outdoor air intake openings are equipped with louvers and bird screens.
l

   .                                          . _.               _ - - . . _ - . _ - ,. . - . - . -                - - . - . _ . _ - = .- . . _ _ .                 .. ...            .. ..                      . _ - .
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                                                               ,                                             ENCLOSURE 18 l
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RBS FSAR
     ,,                                         TABLE 6.5-1 (Cont)
Fuel Building               Main Control Room Reg. Guide                                            Charcoal Fil-                Air-Conditioning Paragraph No.                SGTS                      tration System                    Subsystem 3.p             See Note 9                    See Note 9                  See Note 9 C Maintenance 4.a            See Note 10                   See Note 10                 See Note 10                        '
4.b            In compliance                  In compliance              In compliance 4.c            In compliance                  In compliance              In compliance          '
4.d            See Note 11                   See Note 11                 See Note 11               -
4.e            In compliance                  In compliance              In compliance C In-Place Testing Criteria 5.a            In compliance                  In   compliance            In   compliance 5.b            In compliance                  In   compliance            In   compliance 5.c            In compliance                  In   compliance            In   compliance 5.d            In compliance                   In  compliance            In   compliance C Laboratory Testing Criteria for Activated Carbon
,                       6.a            See Note 12                    See Note 12                See Note 12                       l
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                 ~
6.b            See Note 12                    See Note 12                See Note 12                       l Note 1:         Abnormal pressure drop across all critical components (C-2.g)        of SGTS,    fuel building charcoal                            filtration cystem, and the main control room air-conditioning subsystem trains activates an alarm in the main control room,                                  and flow-through units are indicated in the main control i              room; however, no facilities to                           record these readings are provided.        Computer input is provided to record high-pressure alarms across critical components. wwwk fic; at disch ;g frc syster fans.
The main control room air intake which is upstream of the control room (ESF) filter, the plant exhaust duct which is downstream of the standby gas treatment (ESF) filter, and the fuel building exhaust plenum which is                                            2    i downstream of fuel building (ESF) filter, are each                                                     l provided with redundant safety grade radiation monitors                                                1 for their respective fl ow paths.                             These monitors have
              .                 the capability to indicate and record flow rate in +ka Hme+n-eentr:1 :: r.        If a low-flow condition is detected,                                          l the affected ESF filter                        can be isolated and the 1           Amendment 9                                             2 of 5                                July 1983
   ' Y-                                                                            Except for the monitors in the main control room intakes, these

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'I                                                                                                                                             ENCLOSURE 19 i
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RBS ESAR li '
TABLE 6.5-1 COMPARISON OF ENGINEERED SAFETY FEATURE FILTER
                ,               SYSTEMS WITH REGULATORY GUIDE 1.52 REQUIREMENTS Fuel Building  Main Control Room Reg. Guide                            Charcoal Fil-  Air-Conditioning Paragraph No.   .      SGTS          tration System      Subsystem C Environmental Design Criteria 1
1.a         In  compliance     In  compliance In compliance 1.b         In  compliance     In  compliance In compliance 1.c         In  compliance     In  compliance In compliance 1.d         In  compliance     In  compliance Not applicable 1.e         In  compliance     In  compliance Not applicable C System Design Criteria 2.a         In compliance      In compliance  In compliance 2.b         In compliance       In compliance In compliance 2.c         In compliance       In compliance In compliance 2.d         In compliance       In compliance In compliance 4
(.
(
2.e 2.f In compliance In compliance In compliance In compliance In compliance In compliance 2.g         See Note 1          See Note 1    See Note 1 2.h         See Note 2          See Note 2    See Note 2 2.i         In compliance       In compliance In compliance 2.j         See Note 3          See Note 3    See Note 3 2.k         In compliance       In compliance In compliance 2.1         C2: M t c ':        C: ret:       C: ":t         -
In compliance      In compliance  In compliance gC Component Design Criteria and Qualification Testing                .
3.a         In compliance       In compliance In compliance 3.b         In compliance       In compliance In compliance 3.c         In compliance       In compliance In compliance 3.d         In compliance       In compliance In compliance 3.e         See Note 5          See Note 5    See Note 5 3.f         In compliance       In compliance In compliance 3.g         In compliance       In compliance In compliance 3.h         In compliance       In compliance In compliance 3.i         In compliance       In compliance In compliance 3.j         In compliance       In compliance In compliance 3.k         See Note 6          See Note 6    See Note 6 3.1         See Ncte 7          See Note 7    See Note 7 3.m         In compliance       In compliance In compliance 3.n         See Note 8          See Note 8    See Note 8 fix                       3.o         in compliance       In compliance In compliance
        ~
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RBS FSAR C.                                   TABLE 6.5-1 (Cont) welded steel housing, and verified by surveillance requirements for leakage tests.            A1.1      controls     and instrumentation'necessary to operate the ESF filtere are located outside the filter cubicles :n low radiation                   2 areas.
Metc '- Ecucing l_cch tect: arc pcrfcrmcd in acccrdance with the (C-2.1) previr.icnc cf Cccticn 5 cf ANSI "510''',             : rcccr cnded--    -
in   thic paragraph        "cucver,    ductucrh         tcot;     arc DELETE           perferred ucing acccptabic methods of thc Acccciated Air .,
Ealance Council (TACC)'''
Note 5:  Filter and adsorber mounting frames are constructed and (C-3.e) designed in accordance with the recommendations of Section 4.3 of ERDA 76-21'2)      ,   except for the frame tolerance     guidelines in Table 4.2.              The tolerances selected for HEPA and adsorber mountings are             sufficient to     satisfy     the    bank   leak    test         criteria     of Paragraphs ~C.S.c and C.S.d of Regulatory Guide 1.52.
Note 6:  When   conservative calculations show that the (C-3.k) maximum      decay      heat   generation          from   collected s                   radiolodines is insufficient to raise the carbon bed T.                  temperature    above 250 F with no system airflow, small capacity ESF filter systems may be designed without an air bleed cooling mechanism.
Exception is taken to the requirements of any cooling mechanism satisfying single-failure criteria because a backup mechanism is provided.
The decay heat produced by the radioactive material in i     the inactive charcoal adsorbers of the ESF filter units is   removed by a 100-cfm capacity centrifugal fan (for main control room filter decay fans,              see Fig. 9.4-1c; for fuel building filter decay fans, see Fig. 9.4-2a; and for SGTS filter decay fans, see Fig. 6.2-58) which automatically starts when the main filter exhaust fan stops. The decay fan takes air from the respective
* filter room and exhausts to the respective exhaust duct.
In the event that the 100-cfm decay fan fails,                    the respective main filter exhaust fan can be                     started manually to remove decay heat, since a high temperature in the charcoal adsorbers will be alarmed in the main control room. The temperature will not rise to the level where the adsorption capability of charcoal filter is reduced.
    )      Amendment 2                       4 of 5                        February 1982

RBS FSAR              -
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References - 6.5
: 1. MIL-STD-282-1974, Filter Units, Protective Clothing, Gas-Mask     Components,      and       Related        Products:
Performance - Test Methods, Military Standard.
: 2. ERDA 76-21, Nuclear      Air  Cleaning    Handbook, Oak Ridge National Laboratory.
: 3. ANSI N510-1975, Testing of Nuclear Air Cleaning Systems,                           .
American National Standards Institute.
: 4. RET    Standard M16-IT-1977, Gas-Phase Adsorbents for Trapping Radioactive Iodine and Iodine Compounds, United                       -
States    Nuclear     Regulatory Commission, Division of Reactor Development and Technology.
: 5. ANSI NSC9-1976, Nuclear Power Plant Air Cleaning Units and Components, American National Standards Institute.
: 6. MIL-F-51068-1974, Filter, Particulate, High-Efficiency, Fire Resistant, Military Specification.
: 7. Accccicted Aic Ecicacc Ocuncil, Vol. 1, Mc. 32571.           Air-17        -
Cictributica Cuct Lcckcgc ricld "cct.
DELETE Accccictcd    Air Ecl-cacc Ocuncil, Vcl. 1,          Mc. S1255.
Nctiencl    Ctcadcrd;     for    ricid     McsagrenanL       sud Instruncatstion, "ct:1 Cyctc- Scicnce.
7AI. AMCA 201-1973, Fan Application         Manual, Air Moving and Conditioning Association.                                            .
(An.
6.5-15

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* _           J ENCLOSURE 20 I
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RBS ESAR (f
I (Chapter 14) to verify wiring and control hookup, system inplace integrity, and proper function of system components                     (i and control devices, and to establish system design air flow. Local display and/or indicating devices are provided for    surveillance      of    vital parameters,       such as room temperature. All system ductwork is subjected to leak tests during erection and is balanced in accordance with the sl procedure of the Associated Air Balance Council (AABC)cs)            ,
The ventilation system components are periodically inspected to assure that all normally             operating      equipment      is            ,
functioning    properly.        Maintenance        is provided on a regularly scheduled basis to check and replace filters,                     _
provide lubrication, etc, in accordance with manufacturer's recommendations.
l            9.4.3.4.2   Radwaste Building Ventilation System The radwaste building ventilation system is subjected to preoperational testing in accordance with procedures ofINSERT Chapter 14. 4 rd le-M terted rrd balanced in accordance with sI the procedures of Associated Air Balance Council (AABC)(88 The   system is designed to permit periodic inspection of major   components     such as fans, motors,          belts,    coils,
            - filters,   ductwork,       piping,   and valves      to  assure    the integrity and capability of the system.                Local  display and/or indicating devices are provided for surveillance of
;            vital parameters such as room temperature. Test connections are provided in charcoal filter units and chilled water piping for periodic checking of air and water flows for conformance to design requirements.
The HEPA filters in the c'harcoal filter units are subjected
_to both shop and field efficiency tests. Upon installation,                   '
           'and periodically thereafter, HEPA             filters are given an in-place DOP test in accordance with ANSI N510ca)          . Filters are field tested at rated flow with an acceptance limit of less than 0.05 percent penetration.
9.4.3.5   Instrumentation Requirements 9.4.3.5.1   Auxiliary Building Ventilation System Control switches are provided in the main control room for either automatic or manual operation of the auxiliary building supply and exhaust air fans.                 Interlocks are provided to prevent a fan from starting                  unless     its containment isolation dampers are fully open.
Amendment 5                    9.4-34                     August 1982

INSERT (Page 9.4-34)
The system ductwork is subjected to leak test during erection in accordance with the provisions of Section 6 of ANSI N510-1980, and is      ...

RBS FSAR negative pressure with respect to the main turbine C.df-
    ~7                building area.
: 3. Two 100-percent capacity off-gas vault                    refrigera-tion units are provided (one operating and one on standby) to maintain the charcoal adsorber vault at subsero     temperature          for    continuous         reliable operation.
4 .~ Redundant supply fans of 100-percent capacity are provided for the unit coolers of the steam tunnel                                 ,
and turbine well to ensure a continuous operation of the unit coolers.                                                      ,
: 5. Exhaust air is drawn from within the shielded areas of the turbine building thus inducing airflow from clean areas to potentially contaminated areas.
: 6. The exhaust air from the mechanical vacuum pump is passed through the charcoal filter unit prior to discharge to the plant exhaust duct thus minimizing radioactive release.
9.4.4.4    Inspection and Testing Requirements a l. The turbine building ventilation system is designed to
:"      permit periodic inspection of major components such as fans,
        . motors,    coils,   filters,          ductwork, piping, and valves, to assure the integrity and capability of the system.                       Local display and indicating devices are provided for periodic inspection of parameters such as filter pressure drops.
Test connections are provided in the charcoal filter unit and chilled water piping for periodic checking of air and                         ,
water flows for conformance to design requirements.
The HEPA filters in the charcoal filter units are subjected                            -
to both shop and field efficiency tests.              Upon installation, and periodically thereafter, HEPA filters are given an in-place DOP test in accordance with ANSI N510tas, i           All system ductwork is subjected to leak tests during erection 1and is balanced in accordance with the procedures of the Associated Air Balance Council (AABC)(88                                 l5 9.4.4.5    Instrumentation Requirements Local panels located at different elevations of the turbine l           building provide instrumentation and controls for operation                                   ,
!           of the turbine building area ventilation system. Abnormal I
temperatures, pressures, and flows in the system are alarmed Amendment 5                      9.4-43                            August 1982
  ~
in accordance with the provisions of Section 6 of N510-1980,
                                                                      .__ .__.           __          ~.

ENCI.OSURE 21 i
a
    .m,. . - -----, .. - - - , . - . ,- , - - - - - - .. ,          - - - - - - - - .
                                                                                      -----,,.a      , . , - - - - ,       - , + -    , -- . ------ - , - - - .

RBS FSAR
                                                  -is located on elevation 71'-0" of of the control building and The standby switchgear room 0.ir-conditioningrconsists of an                      A air-conditioning subsystem for the three switchgear rooms with associated individual battery room air exhaust systems.
The standby switchgear rooms air-conditioning subsystem provides heating, cooling, and ventilation to the standby switchgear rooms, the associated battery rooms, the cable vault, and the general            areas.       The     air-conditioning subsystem maintains a maximum air temperature of 1040F for the switchgear-rooms and cable vault and 900F for the battery rooms and general areas. The subsystem is designed                          ~
to operate during normal, shutdown, loss of offsite power, and DEA conditions without a loss of function.                               -
Air   is  supplied     to  the    standby     switchgear     rooms     from redundant 100-percent capacity air-conditioning units.                 Each unit consists of a fan, filter, chilled water coil, and electric heating coil. Redundant full capacity fans return 25,300 cfm to the operating air-conditioning unit.                       An electric heating coil is located in the air handling unit to maintain a minimum supply air temperature. Smoke removal is provided by a separate subsystem consisting of an exhaust fan and dedicated ductwork.         The smoke removal subsystem is seismically    supported,    but    is    not    designed      for      DBA
  ' conditions. A   description of the operation of the standby switchgear room and cable vault smoke removal Section 6.4.2.
is   given     in
(
Each battery room is provided with an exhaust subsystem which includes redundant full capacity exhaust fans.                    The ventilation supply air for each battery room is provided by the standby switchgear rooms air-conditioning units.               There is no air recirculation from the battery rooms. Smoke removal is provided for each battery room using redundant gexhaust fans and exhaust ductwork.                                              -
The standby switchgear rooms and associated battery rooms are isolated from other areas in the building by fire doors, fire dampers, and fire rated walls. All fire dampers are thermally operated by means of a fusible link.
9.4.1.2.3    chiller Equipment Room Air-Conditioning Subsystem The    chiller     equipment room air-conditioning subsystem consists of an outside air supply,                 room exhaust, and redundant full capacity unit coolers.                 The outside air supply provides 1,100 cfm ventilation air supply to the chiller equipment room. An electric heating coil is located in the supply ductwork to maintain minimum supply air 9.4-6

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ENCLOSURE 22 1
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   , , _            _       bm       - 1 a                a _-                        k - .--                       A    a ENCLOSURE 23 5
4 t

RBS FSAR following features are incorporated in its design to ensure
(:.           system reliability and to minimize the uncontrolled release of airborne radioactive contaminants during normal plant operation:
: 1. Fifty percent standby capacity of the main exhaust fans ensures full system capacity with any unit inoperative due to equipment failure or maintenance cutage.
: 2. The radwaste building exhaust air is monitored by                  ,
radiation detectors prior to discharge, to ensure against release of radioactive contaminants.1-En the    ecent    cf     detecti:n    2 .' -   high   cirbcrne  -5
: dia::tiviti      in    the building,        admir.istrative eeneeul ic required te chut dcun the cye w .
: 1. Redundant    unit coolers for sample room, le.undry room, and formaldehyde area ensure supply system operation in the event of single fan failure.
: 4. All    exhaust     air from waste          tanks and other equipment handling radioactive materials is passed through    the     charcoal    filter        unit prior to discharge,     thus     minimizing      the     release    of
    .                   radioactive contaminants.
 -                5. A   manually actuated water spray fire protection system is provided for each filter unit to protect against possible fire in the filters.
: 6. The redundant 100-percent capacity of the charcoal filtration system for prccessing contaminated tanks and shielded compartment exhaust ensures continued cperation of the system at all times.
The radiation monitors continuously sense                the radiation level and automatically send an alarm signal             to the main contrcl room (Section 12. 3. 4) .
MOVE        _
TO TOP The radwaste building ventilation system is shut down OF PAGE       manually upon detection of high radiation levels in the
_ common air exhaust duct.
9.4.3.4   Inspection and Testing Requirements 9.4.3.4.1   Auxiliary Building Ventilation System The auxiliary     building ventilation system is subjected to preoperational    testing in       accordance       with    procedures
   ..                                         9.4-33
   ~

ENCLOSURE 24 I
l l
l l
l i
i b

RBS FSAR TABLE 1.8-1 (Cont)
Regulatory Guide 1.140, Rev. 1 (October 1979)
Design, Testing, and Maintenance criteria for Normal Ventilation Exhaust System Air Filtration and Adsorption Units of Light-Water-cooled Nuclear Power Plants Proiect       Assessment - Comply,       with       the           following clarifications and exceptions:
: 1.      Paragraph   C.2 4 - Regulatory Guide            8.8 will be addressed in a future amendment.
: 2.      "cr:;ra;F      C. 2. f  "cccing       le:P      tdete                               are perforacd in accordancc with thc guide, but ductasch leak tecte are performed usi=g the mcLuvdo vi inc Aoovviated Alu Ealauve cuuuvil iactced of ANCI N510-1975.
Thc acthod;     rcccamcadcd by the Acccciated Air "clencc Cemacil arc concidcrcd to 5; acceptable
   -               alternatiecs to ANCI M510-1075.
: 3.      Paragraph   C.3.c - For HEPA filters and adsorber mountings, the requirements of ANSI N509-1976 Section 5.6.3 are complied with except for the tolerance requirements. The tolerances for HEPA filters    and     adsorber       mounting      frames are sufficient to pass the bank leak tests                                               of paragraphs 5.c and 5.d of the guide.
l    -             An acceptable bank leak rate is the primary                                               -
!                  objective. Variations in manufacture from the l
tolerance      values      listed      in      ORNL-NSIC-65 (Table 4. 2) are considered to be acceptable.
: 4.      Pa ragraph  C.3.h - Exception is taken to Section 5.2.2.4 of ANSI N509-1976 which calls for a means l
of compaction to uniform density.             Where uniform
;                  compaction can be demonstrated, compacting means l
are not required.
A   means for compaction, vibratory or otherwise,
!                  need not be mandatory if uniform compaction is demonstrated.
k                                182 of 193 1

I 1
1 RBS FSAB                                               '
(-             following features are incorporated in its design to ensure
(: .           system reliability and to minimize the uncontrolled release of airborne radioactive contaminants during normal plant operation:
: 1. Fifty percent standby capacity of the main exhaust fans ensures full system capacity with any unit incperative due to equipment failure or maintenance cutage.
: 2. The radwaste building exhaust air is monitored by radiation detectors prior to discharge, to ensure against release of radioactive contaminants. i-En the    clect       cf    dctcctic.-   cf     high      cirhcrne      -
rcaiccctivity         in    thc building,     cdministrctive centrcl ic required tc chut doen the cyctem.
: 3. Redundant    unit coolers for sample room, laundry room, and formaldehyde area ensure supply system operation in the event of single fan failure.
: 4. All    exhaust        air from waste tanks and other equipment handling radioactive materials is passed through    the        charcoal    filter     unit prior to discharge,      thus      minimizing     the    release         of radioactive contaminants.
: 5. A   manually actuated water spray fire protection system is provided for each filter unit to protect against possible fire in the filters.
: 6. The redundant 100 percent capacity of the charcoal filtration system for processing contaminated tanks and shielded compartment exhaust ensures continued cperation of the system at all times.
The radiation monitors continuously sense                  the radiation level and automatically send an alarm signal               to the main
                 'contrcl room (section 12.3.4).
M0'E       _                                                                                         .
TO TOP  -~
The radwaste building ventilation system is shut down OF PAGE       manually upon detection of high radiation levels in the
_ccamon air exhaust duct.
INSERT A                 1 9.4.3.4     Inspection and Testing Requirements l                9.4.3.4.1     Auxiliary Building Ventilation System The auxiliary        building ventilation system is subjected to preoperational       testing in         accordance     with    procedures
_y                                                9.4-33 l

                                     ---                                               e            9 ,
M INSERT A (For Page 9.4-33)
A detailed description of compliance of the radwaste building ventilation system (RBVS) charcoal filtration system with positions C.I.a through C.I.d and C.2.a through C.2.e of Regulatory Guide 1.140 is provided as follows:
C.I.a          The design of the charcoal filtration system is based upon
 ;                         the maximum operating parameters of temperature (105'F),
pressure (atmospheric) , relative humidity (20-100%) , and radiation levels (70 rads).
C.I.b          The charcoal filtration unit is not located in areas of high radiation during normal plant operation so no special shielding of the components from the radiation source needs to be provided.
l C.I.c          No engineered-safety-feature system that must operate after a design basis accident will be adversely affected by the charcoal filtration system's operation in the radwaste building.
C.I.d          Contaminants that could damage the filter units were evaluated. No contaminants were identified that could damage the units.
C.2.a           In accordance with Regulatory Guide 1.140, the RBVS charcoal filtration system consists of fans, dampers, ductwork, and filter units. Each filter unit consists of a moisture separator, an electric heating coil, a prefilter, a HEPA filter, a charcoal iodine adsorber bank, and another HEPA filter.
C.2.b          The volumetric air flow through the RBVS unit is 4000 CFM.
l l_         C.2.c          The charcoal filtration system's instrumentation is i                         designated to monitor and alarm pertinent pressure drops and flow rates in accordance with the recommendatians of Section 5.6 of ERDA 76-21 (see Figure 9.4-3a). Each filter bank, moisture separator, and charcoal adsorber has it's own pressure differential monitors. Flow indicators are provided to ensure that the flow is in the desired range. High Delta P and low flow conditions are alarmed on a local panel.
.          C.2.e         The outdoor air intake openings for the RBVS consist of a l                         louvered intake plenum with filter banks to ensure that contanimants do not enter the system (see Figure 9.4-3a).
4

RBS FSAR                                                              !
l dQ8L                         negative pressure with respect to the main turbine X50                         building area.                                   -
: 3. Two 100-percent capacity off-gas vault                        refrigera-tion units are provided (one operating and one on standby) to maintain the charcoal adsorber vault at subzero    temperature                   for   continuous             reliable operation.
: 4. Redundant supply fans of 100-percent capacity are provided for the unit coolers of the steam tunnel and turbine well to ensure a continuous operation of the unit coolers.
: 5. Exhaust air is drawn from within the shielded areas of the turbine building thus inducing airflow from clean areas to potentially contaminated areas.
: 6. The exhaust air from the mechanical vacuum pump is passed through the charcoal filter unit prior to discharge to the plant exhaust duct thus minimizing radioactive release.
INSERT B 9.4.4.4     Inspection and Testing Requirements
    . p3             The turbine building ventilation                         system is designed to u j$             permit periodic inspection of major components such as fans, motors,     coils,   filters,   ductwork, piping, and valves, to assure the integrity and capability of the system.                                   Local display and indicating devices are provided for periodic inspection of parameters such as filter pressure drops.
Test connections are provided in the charcoal filter unit and chilled water piping for periodic checking of air and water flows for conformance to design requirements.
The HEPA filters in the charcoal filter units are subjected to both shop and field efficiency tests. Upon installation, and periodically thereafter, HEPA filters are given an
 .                    in-place DOP test in accordance with ANSI N510ca)                     ,
All     system ductwork    is subjected to leak tests during erection and is balanced in accordance with the procedures j                     of the Associated Air Balance Council (AABC)<s>                     ,
l5 9.4.4.5     Instrumentation Requirements Local panels located at different elevations of the turbine building provide instrumentation and controls for operation of the turbine building area ventilation system. Abnormal temperatures, pressures, and flows in the system are alarmed Amendment 5                  9.4-43                                   August 1982 g,
{
l

INSERT B (For Page 9.4-43)
A detailed description of compliance of the turbine building ventilation system (TBVS) charcoal filtration system with positions C.I.a through C.I.d and C.2.a through C.2.e of Regulatory Guide 1.140 is provided as follows:
C.I.a  The design of the charcoal filtration system is based upon the maximum operating parameters of temperature (96*F),
pressure (atmospheric), relative humidity (20-100%), and radiation levels (10 rads).
C.I.b  The charcoal filtration unit is not located in areas of high radiation during normal plant operation so no special shielding of the components from the radiation source needs to be provided.
C.I.c  No engineered-safety-feature system that must operate after a design basis accident will be adversely affected by the charcoal filtration system's operation in the turbine building.
C.1.d  Contaminants that could damage the filter units were evaluated. No contaminants were identified that could damage the units.
C.2.a  In accordance with Regulatory Guide 1.140, the TBVS charcoal filtration system consists of fans, dampers, ductwork, and filter units. Each filter unit consists of a noisture separatcr, an electric heating coil, a prefilter, a HEPA filter, a charcoal iodine adsorber bank, and another HEPA filter.
C.2.b  The volumetric air flow through the TBVS unit is 5000 CFM.
C.2.c  The charcoal filtration system's instrumentation is designed to monitor and alarm pertinent pressure drops and flow rates in accordance with the recommendations of Section 5.6 of ERDA 76-21 (see Figure 9.4-3a). EE.7h filter bank, moisture separator, and charcoal adsorber has it's own pressure differential monitors. Flow indicators are provided to ensure that the flow is in the desired range. High Delta P and low flow conditions are alarmed in the auxiliary control room.
( C.2.e  The outdoor air intake oper.ings for the TBVS consist of a louvered intake plenum with filter banks to ensure that contanimants do not enter the system (see Figure 9.4-3a) .
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ENCLOSURE 25 d
4 1
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  . , . . _ , .r___,._.___ ___. . __ _ . . - m-- . . , , . , _ _ ,. , , - _ , . ...         .__ . , - _ _ . - , . , , , . . . . _ . _ , _ , _ _ _ . , .

         'o RBS ESAR
: 2. Main steam pipe tunnel, north end
: 3. East and west general areas, annulus mixing system, and charcoal filter room
: 4. Charcoal filter rooms
: 5. HPCS pump cubicle
: 6. RHR pump room and heat exchanger cubicle
: 7. RPCCW pumps and heat exchanger cubicles
: 8. RWCU pump cubicle
: 9. RCIC pumps and turbine cubicle
: 10. General areas
: 11. LPCs pump cubicle.
Each unit cooler consists of a housing, throw-away type filters, cooling coils, vaneaxial fan, and ductwork.                         The unit coolers are designed for adequate air recirculation to m       remove heat dissipated from electrical equipment, piping, motors and to maintain design ambient temperature. Warm building air is cooled by recirculating the air through cooling coils by the unit cooler fans. Cooling water for the cooling coils is provided by the normal service water system   (Section 9.2.1) .          During loss of offsite power and DBA conditions, the cooling water is supplied by the standby service water system as described in Section 9.2.7. During less of offsite power or during EBA conditions coincident with loss of offsite power, power for the unit coolers is provided by the independent standby buses. The unit cooler l
protecting an ECCS component is connected to the same bus supplying power to the ECCS component.
There are three units              coolers serving the safety-related pump rooms as follows:
!    INSERT l                 h. Crcup '        Thc "PCC pump ra^      cerecd by unit eccler l                        "UVRt,UC5.
: 2. Guuay 2        The nn; hcat cxchangcro A and C and pump roca A, thc 1000 pump roca, and the DCIC pump                 rocr OczJcd by unit cccler 1 EVE *UC6.
: 3. Crcup 3         Thc RUC tcat exchangcra E00 end Iccm D, and pnmp room C served by Unit ccoler 1HVRtUC3.
    \-                                            9.4-27 4

INSERT (For Page 9.4-27)
There are three unit coolers serving the safety-related pump rooms as follows:
: 1. Group 1 - The HPCS pump room which contains the high pressure core spray pump and discharge line fill pump is served by unit cooler 1HVR*UC5.
: 2. Group 2 - The RHR heat exchangers A and C and pump room A which contains the residual heat removal pump and heat exchangers, the LPCS pump room which contains the low pressure core spray pump and discharge line fill pump and the RCIC pump room which contair.s the reactor core isolation cooling pump, turbine, and discharge line fill pump are served by unit cooler 1HVR*UC6.
;                        3. Group 3 - The RHR heat exchangers B and D and pump room B, which contains the residual heat removal pump and heat exchangers, and the RHR pump room C which contains the residual heat removal pump and discharge line fill pump are served by unit cooler 1HVR*UC9.
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_    _ , . . ~ .       _    . . _ . _ . _ _ , . . . . . - __ _ . . _ - _ _ _ . - . . _ , . _ . , _ . _ , . _ _ _ . _ _ _ _ _ _ , , - _ , . ,                     _ _ _ . _ _ , _ _ _ . - . .

O Eh                                                      D' j,f RBS FSAR
                                                                                                                                    . TABLE 3.2-1 (Cont)
Quality (38 Tornado (*8               Scope (*)
Safety (aa seismic (a3     Assurance   Protection            ,   of        Design (78 Class       Category       cateocry    Designation Locatien(s3 Supply      Detail     N_ote s
: 4. Containment unit cooler ductwork up to pressure relief damper                                                               2            I               B            E           C          P         S
: 5. Ductwork, other                                                                          NNS            NA              S            E           C          P        S 60   Dampers, other                                                                           NNS            NA              S            E           C          P        V                 2
: 7. Dome recirculation fan                                                                   NNS            NA              S            E          C           P        V
: 8. Containment unit cooler (1HVR*UCIC)                                                      NNS            NA             S             E          C  '
P        V XXI. Auxiliary Building ventilation System
: 1.          Outside air intake ductwork from tornado damper to isolation damper                                                         3             I              B            E           A           P        S 20            Unit cooler ductwork                                                                       3             I              B            E           A           P        S
: 3.            Unit cooler dampers                                                                        3            I               B            E           A           P        V 00             Exhaust ductwork to isolation dampers                                                                       3            I               B            E           A           P        S So           Inlet isolation dampers                                                                     3             I              B            E           A           P        V
: 6.            Outlet isolation dampers                                                                   2            I               B            E           A           P        V 70             Air exhaust system ductwork from isolation damper to tornado dampers                                                                            2            I               B            E           A          P         S
: 8.            Inlet tornado dampers                                                                      3            I               B            P           A          P         V
: 9.             Outlet tornado dampers                                                                     2            I               B            P           A           P        V 100                    Fire dampers                                                                               3            I               B            E           A          P         V
: 11.                    Exhaust system balancing dampers                                                                                    3            I               B            E           A          P         V
: 12.                     Erha ust system backdraft dampers                                                                                    3            I               B            E           A          P        XV
: 13.                     Inlet and exhaust fans                                                                   NNS            NA              S            E           A          P         V
: 14.                     Intake and exhaust filters                                                               NNS            NA              S            E           A          P        V
: 15.                     Dampers, other                                                                           NNS            NA              S            E           A          P         V
: 16.                      Ductwork, other                                                                          NNS            NA              S            E           A          P         S m                                                                                           INSERT
  .(XII . Pow'er conversion System
: 1.             Main steam line (MSL) from second isolation valve to and including first field weld outside the jet impingement wall and all branch lines out to and including the first valve in the branch line                                                             1            I               B            E           A          P        S      (103
                                                                                                                                                                              .s nendment 2                                                                                                                                        11 of 19                              February 1982
: b.                                                                                         r                  .-            - _a -.a.-
                                                                                                                                                                  -     2., a 1
J ENCLOSURE 26 I
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INSERT (For Table 3.2-1, Sh. 11)
Quality (3)  Tornado (4)                   Scope (6)
Safety (1) Seismic (2)     Assurance    Protection                       of      Design (7)
Class   Category    Category   Designation       Location (5) Supply      Detail        Notes
: 17.              Unit coolers / coils              3/3   .I             B     E-                A            P           V i
(111VR*UC2 through
  !                      UC11A, B) 18               Unit cooler 1HVR-UC14             NNS    NA            S     E                 A            P           V f
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i ENCLOSURE 27                                                               .
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RBS FSAR Failure of any one unit cooler affects no more than one                                                       ''
INSERT A        group of safety-related pump rooms.          Each cooler is supplied
                 -~
by its associated independent standby service water supply
                           ~
   '                 _agd served by an independent standby bus.
lsafety''s.
related      Thek unit coolers' cooling coil construction conforms to the requirements of ASMEC7) Section III, Class 3 and bears the N stamp.      The cooling coils' framing and supports conform to the requirements of subsection NF of ASME Section III, Division I.                                                                                                         ,
INSERT B               &
9.4.3.2.2     Radwaste Building Ventilation System The      radwaste building ventilation system is shown in Fig. 9.4-3a and 9.4-3b. The principal system components and their performance data are listed in Table 9.4-5. The radwaste building ventilaticn system is a                                       100-percent outside      air   supply   and   exhaust               system,                      providing once-through air flow with no recirculation.
The system consists of a common air intake built-up filter unit, unit coolers, and distribution ductwork.                                 The filter unit      consists   of an insulated steel cabinet housing prefilters, high-efficiency filters, intake dampers, and
                    . plenum.       The prefilters are of             renewable roll type,                                         . .;
automatically progressed to maintain uniform pressure drop.                                                       -
              .       The high-efficiency filters are of extended surface type.
Each unit cooler consists of a housing, cooling coil, i
electric heating coil, vaneaxial                fan,                and              ductwork.
Prefilters and high-efficiency filters function to remove dust particulates from the outside air before it                                                    is
;                     delivered to the system. Electric coils are provided for temperature and humidity control.
All unit coolers draw outside air from the intake plenum through ductwork.      The cooling coils are provided with chilled water from the radwaste building chilled water j                     system (section 9.2.9) . Distribution duct from the unit
,                     coolers supplies air to the clean areas. Air is exhausted l                     from potentially contaminated areas only, thus maintaining
:                     air flow from clean to contaminated areas.
During ncrmal plant operation, the supply system operates continuously, providing tempered air throughout the building via unit coolers and the supply duct distribution system.
f                     The radwaste building supply system has no safety functions and is inoperative in the event of a loss of offsite power.
The exhaust air system is divided into two sections:
9.4-28 (1
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1

INSERT A (For Page 9.4-28)
With the exception of unit cooler IllVR-UC14, the unit coolers are classified as Safety Class 3 and Seismic Category I.
INSERT B (For Page 9.4-28)
Unit cooler 1HVR-UCl4 is not designed to meet safety class or Seismic Category I requirements since it is not required to operai.e following a postulated DBA or loss of offsite power.
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a ENCLOSURE 28 I
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   , .. - .--.---,-- ~~ -- , - - - - - - -            . - . - . . , . .

RBS FSAR TABLE 9.4-4 (Cont)
: 10. Unit Cooler Equipment Mark No.                                    1HVR*UC10 Cooling capacity (mbh, max)                           109.4 Cooler air flow (cfm)                                 4,900 Fan type                                              Vaneaxial Motor (hp)                                            5 Cooling medium                                        Standby service water Flow rate (gpm, max)                                  37 Leaving air temp dry / wet bulb (OF)                                            100/82                                                   -
: 11. Unit Cocler Equipment Mark No.                                    1HVR*UC11A S 11B Cooling capacity (mbh, max)                           1214.7 Cooler air flow (cfm)                                 53,000                                                       '
Fan type                                              Vaneaxial Motor (hp)                                            75 Cooling medium                                        Standby service water Flow rate (gpm, max)                                  410 Leaving air temp dry / wet INSERT                          _
13 Jf. Supply Fans Equipment Mark No.                                    1HVR-FN6A & 6B Type                                                  Vaneaxial direct drive Airflow capacity (cfm)                                10,000 Total pressure capability (in W. G.)                                          6 Speed (rpm)                                           3550 Motor (hp)                                            15 i             Type of discharge                                     Horizontal                                                 -
14 #3'. Roll Type Air Filter Equipment Mark No.                                    1HVR-FLT2 Total air capacity (cfm)                              10,000 Filter pressure drop (dirty)
(in W.G.)                                           1.5 Face velocity (max, fpm)                              475 Filter efficiency (average)                           85% NBS Filter media thickness (in)                           2 15 J(. Extended Surface Type Filters Equipment Mark No.                                    1HVW-FLT7 Total air capacity (cfm)                              10,000 Filter pressure drop (dirty)
(in W.G.)                                           0.7
(                                                                          3 of 4

RES FSAR TABLE 9.4-4 (Cont)
Face velocity (max, fpm)                   475 Filter efficiency (average)                95 ASHRAE 52-76 Filter media thickness (in)                22 16 M. Exhaust Fans Equipment Mark No.                         1HVR-FN7A & 7E
    .                Airflow capacity (cfm)                     10,000                      '
Total pressure capability (in W.G.)                                6 Speed (rpm)                                3550                  ~
Motor (hp)                                 20                      ,'
Type of discharge                          Horizontal E
4 of 4

INSERT (For Table 9.4-4, Sh. 3)                 l
: 12. Unit Cooler                                 l Equi l5 ment Mark No.       _
1HVR-UC14     I Cooling Capacity (mbh, max)   68,200 Cooler Air Flow (cfm)         3500 Fan Type                      Centrifugal   ,
Motor (hp)                    10 Cooling Medium                Chilled water Flow Rate (gpm, max)          11 Leaving Air Temp. Dry / Wet Bulb ('F)                   62.6/61.7

ENCLOSURE 29 i
1
)
r - .,, .- ,-- - - - - - . - - - . , . . _ . ._ . . . , _ . - . .-     , - - . . - - - - - - -.   - . , , , _ . , , _ - - , - - , , , _ , . . - . . . - - - - - - . , , - - - - - -

F BBS FSAR
: 3.       Redundant  unit coolers are provided for essential                                        C.
areas to ensure that this part of the system satisfies the single-failure criteria.
: 4.       The fresh air intake for the ventilation system is protected by a missile barrier (Fig. 1. 2-13) .                                       The air intake is designed so as to prevent direct impingement on the system ductwork from any type of precipitation.                    The air intake opening is designed for a low velocity of approximately 250 ft/ min to minimize water droplet carryover.                         A protective bird screen of 1/2 in square,                     16-gauge mesh is provided to prevent accumulation and subsequent blockage by either snow or ice.
The syatem capacity is based on maximum summer ambient design air temperature and the hea1 generated by equipment, motors,        electrical components,                     piping and pipe hangers, valves and lighting.                  Heat dissipation within the areas where safety-related equipment is located, are analyzed individually to establish air quantities for effective cooling.
A    radiation monitor is                     provided in the exhaust duct. High                             '
radiation exceeding set                         point in the auxiliary building
                                                                                                                              .I exhaust duct sounds an                         alarm in the main control room, and air is manually diverted                       to the SGTS.
The auxiliary building normal exhaust path is provided with redundant, air operated, fail-closed isolation dampers to preclude the possibility of airbcrne radioactivity bypassing the boundary regions of the SGTS. In the event of failure of the nonsafety-related portion of the auxiliary building ventilation system due to a seismic event or malfunction of equipment, the safety-related portion is isolated by the redundant isolation dampers                            without   jeopardizing                        the ventilation system.
Failure of the nonsafety-related portion of the system does not compromise any safety-related system or component and does not prevent safe reactor shutdown.
The SGTS performs the operations required for control of radioactivity following an accident. Refer to Section 6.5 for a description of this system.
INSERT           :
9.4.3.3.2 Radwaste Building Ventilation System The radwaste building heating and ventilation system is not required for a safe shutdown of the plant; however, the                                                   .,
9.4-32                                                         -

INSERT (For Page 9.4-32)
The auxiliary building system ductwork conveying exhaust air to the lSGTS in the event of a high exhaust radiation signal complies with the guidelines of applicable portionc of Position C.2 of Regulatory Guide 1.52 as follows:
C.2.a  The auxiliary building ventilation system ductwork and damper arrangement is designed with sufficient redundancy to meet single-failure criterion (see Figure 9.4-7a).
C.2.d  Pressure surges resulting from a postulated accident on the auxiliary building ductwork will be analyzed and the system will be revised, if necessary, to support the findings of the analysis.
C.2.e  The effects of radiation on the ESF system components such as controls, joining compounds, dampers, gaskets and other organic-compounds materials that are necessary for operation during a postulated DBA have been considered.

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i ENCLOSURE 30 t
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RBS FSAR QUESTION 410.63 (9.4.3)
Table 9.4-1 indicates a design temperature range in the auxiliary building supply and exhaust system of 122 F
             ,       maximum and 40 F minimum. Describe the means provided for meeting the minimum temperature in the winter when the plant is shut down.

===RESPONSE===
The     response to this request cill he pre cided h-, Jun                      10S2. 7 is provided in revised Section 9.4.3.2.1.1 and 9.4.3.5.1, and                       ._
in revised Table 9.4-4.
                          ~
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4 8
       .             Amendment 7                        Q&R 9.4-11              February 1983

RBS FSAR h4                9. Design charcoal filtration units in accordance with Regulatory                   Guide 1.140        (see   Table 9.4-6   for exceptions) .
               - 9.4.3.2     System Description 9.4.3.2.1     Auxiliary Building Ventilation System The auxiliary building ventilation system is shown in Fig. 9.4-7a through 9.4-7c. The principal system components and their performance data are listed in Table 9.4-4. The auxiliary building contains equipment for normal plant operation and safety-related equipment valves, switchgear,                           .
safety-related instrumentation, cables, and control wiring required for safe shutdown of the plant.
The auxiliary building                       ventilation system consists of the following systems:
: 1. Supply air system
: 2. Exhaust air system
: 3. Unit coolers system.
1 m:           ~9.4.3.2.1.1     Supply Air System Thc    ccpp1; cir cyctcr ccccictc cf tu: 100 perccnt-ccpccity, 14,000 cfm vanea ial f&na, & eiefilter, high-efficiency REPIACE    filterc, d; p;;c,                     ccd dcctccrk,         ;h; prcfilter; crc c; ;
WIUI        rencWahic Icll type, automatically pzGgscsced to ma2nlain INSERT 1   ccifc;g    p;;;;;;c drge,                       hc L2 3 h_c;;;ciency filtcg3 3re g; catended curfacc typc. Thc supply air system aezves the fclicuing      arc;c           within the auxiliary building through
                 .diaLIlhutica ductwork.
: 1. Normal switchgear and terminal box areas
: 2. Control rod drive (CRD) transfer and work area
: 3. RPCCW pump and heat exchanger area
: 4. RHR heat exchangers and pump rooms
: 5. Work area and miscellaneous areas.
l                 The     supply     air from these areas flows to areas of i                 progressively higher                      potential        contamination   and   is exhausted      by     the exhaust air system.                        During normal operation the supply air system operates continuously, 9.4-25 l
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     .          INSERT #1 (For Page 9.4-25)
The supply air system consists of two 100-percent capacity 10,000 CFM vaneaxial fans, a prefilter, high-efficiency filters, one 100-percent capacity 80 KW electric duct heater, dampers, and ductwork. The prefilters are of a renewable roll type, automatically progressed to maintain uniform pressure drop. The high-efficiency filters are of extended surface type. The electric duct heater is a duct-mounted, staged type heating coil. The supply air system serves the following areas within the auxiliary building through distribution ductwork.
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RBS FSAR providing ventilation air. The supply air system is not in          C.
operation during a DBA or when a high radiation level exists within the building.          All components     of the supply air system are nonnuclear safety class and nonseismic, with the exception of outside air intake and isolation dampers which are designed to Seismic Category I and Safety Class 3 requirements. Ventilation air for the auxiliary building is drawn through a common missile protected         and tornado-proof opening serving both the containment and auxiliary buildings and is designed to meet seismic Category I requirements (Fig. 1.2-13).       Redundant isolation dampers are provided in the outside air intake to prevent any outleakage                of radioactivity during a postulated seismic event.                   -
INSERT 2 9.4.3.2.1.2     Exhaust Air System The exhaust system consists of two 100-percent capacity, 10,000 cfm exhaust fans, dampers, ductwork, and necessary controls. The ventilation air is induced into cubicles from the general building areas, thus keeping the cubicle at a slightly negative pressure and ensuring flow of air from areas of less to progressively greater potential radioactive contamination.        The exhaust air is continuously monitored for radioactivity in the main control room by a radiation
             , monitoring      system      located     in    the  exhaust   duct
(
f (Section 12. 3. 4) . In   the   event     that  radioactivity approaches a predetermined level, specified in the Technical Specifications, main control room operators can manually shut down the supply fans and reroute the exhaust air through the SGTS (Section 6.5).        Each fan is connected with an automatic open/close damper which operates in conjunction with the fan.
During the DBA, the auxiliary building ventilation system in iconjunction with the SGTS maintains 1/4 in W.G. negative pressure within the building. At this time, the supply and exhaust air systems are shut down, and the exhaust air is diverted to the SGTS.
l l             The   exhaust fans are used for smoke removal in the event of fire in the auxiliary building              during  normal   plant operation.
9.4.3.2.1.3    Unit Coolers System I             Unit coolers are provided for removal of heat           dissipated from equipment for the following areas:
: 1. Switchgear areas 9.4-26                                -

INSERT #2 (For Page 9.4-26)              .
The one 100-percent capacity outside air heating coil tempers the supply air during conditions of low outside ambient temperature to maintain the auxiliary building minimum design temperature.
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RBS FSAR (Chapter 14) to verify wiring and control hookup, system inplace integrity, and proper function of system components f
                                                                                                          \
and control devices, and to establish system design air flow. Local display and/or indicating devices are provided for     surveillance       of    vital parameters,         such as room temperature. All system ductwork is subjected to leak tests during erection and is balanced in accordance with the si procedure of the Associated Air Balance Council (AABC)<s>                   ,
The ventilation system components are periodically inspected to assure thht all normally                operating       equipment       is            .
functioning      properly.       Maintenance      is provided on a regularly scheduled basis to check and replace filters,                          _
                                                                                                  '~
provide lubrication, etc, in accordance with manufacturer's recommendations.
9.4.3.4.2      Radwaste Building Ventilation System The radwaste building ventilation system is subjected to preoperational testing in accordance with procedures of Chapter 14, and leak tested and balanced in accordance with sI    the procedures of Associated Air Balance Council (AABC)<s)                  ,
The    system is designed to permit periodic inspection of
                 . major     components such as fans, motors,              belts,       coils,
                 . filters,       ductwork,      piping,   and valves to assure the                       (
integrity and capability of the system.                   Local display               (
and/or indicating devices are provided for surveillance of vital parameters such as room temperature.            Test connections are provided in charcoal filter units and chilled water piping for periodic checking of air and water                    flows for conformance to design requirements.
The HEPA filters in the charcoal filter units are subjected
_to both shop and field efficiency tests.             Upon installation,
: and     periodically thereafter, HEPA             filters are given an l                   in-place DOP test in accordance with ANSI N510(3)             . Filters are field tested at rated flow with an acceptance limit of less than 0.05 percent penetration.
9.4.3.5    Instrumentation Requirements i
9.4.3.5.1     Auxiliary Building Ventilation System Control switches are provided in the main control room for either automatic or manual operation of the auxiliary building supply and exhaust air fans.                    Interlocks are provided to prevent a fan from starting                     unless      its containment isolation dampers are fully open.
INSERT 3 Amendment 5                     9.4-34                       August 1982

INSERT #3 (For Page 9.4-34)
Control logic is provided to stage the electric duct heater to maintain the supply air temperature within a predetermined range and to deenergize the heater at a high air temperature condition.
I 1

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RES FSAR                                                 j TABLE 9.4-4 (Cont)
Face velocity (max, fpm)                                 475 Filter efficiency (average)                              95 ASHRAE 52-76 Filter media thickness (in)                              22 16 J6. Exhaust Fans Equipment Mark No.                                       1HVR-FN7A 6 7E Airflow capacity (cfm)                                   10,000 Total pressure capability (in W. G. )                                            6 Speed (rp:a)                                             3550 Motor (hp)                                               20 Type of discharge                                        Horizontal INSERT 4          3 i
4 of 4 l

INSERT #4 (For Page 4 of Table 9.4-4)
: 17. Electrical Duct Heater Equipment Mark No.             1HVR-CH1 Type                          Finned Tubular capacity                      80 kw Stages                        4 I
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ENCLOSURE 31 i
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ENCLOSURE 32 s
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RBS FSAR QUESTION 410.54 (9.4.5)                                                                                                                      (
Table 9.4-1 indicates that a minimum temperature of 40*F will be maintained in the diesel generator buildings and
         . standby     service         water pumphouse.                                        Describe the means provided for maintaining this temperature in the winter when the   diesels         or standby service water pumps are not operating.
RESPONSE            -
                             -    --                     - w   n e n                            y              y       gg              g REPI, ACE WIDI INSERT l
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i l
Amendment 7                         Q&R 9.4-12                                             February 1983 l
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: l. . _ _      _     ..    -_         -   _ _ _ _ _ _ ___         - - - - _ _ _ . . - _ . - _ .         - - . . - - - - - - - - - - - -      ---- - - - -

F' INSERT (For Page Q&R 9.4-12)
The response to this request for the diesel generator building is provided in revised Section 9.4.5.2.2 and in revised Table 9.4-8.
The response to this request for the standby service water pumphouse is provided in revised Sections 9.4.5.2.3.1 and 9.4.5.2.3.2, and in revised Table 9.4-8.

RBS FSAR control room is ventilated by one dedicated supply fan controlled to start on high ambient diesel generator control room temperature.      Power to each fan is supplied from normal offsite power or its respective diesel emergency bus.
Ventilation air. from the diesel generator control room is exhausted through fire protected openings to the diesel generator room.
Each' diesel generator       room is provided with a nonsafety-related and nonseismic ventilation fan to prevent stagnation         ,
of room air.
INSERT A               ;
9.4.5.2.3     Standby Service Water (SSW) Pump House Ventilation System The SSW pump house ventilation system serves the SSW cooling tower pump house pump rooms and switchgear rooms.
The pump house ventilation system is shown in Fig. 9.4-6b.
The major system components and performance data are listed in Table 9.4-8.
9.4.5.2.3.1     SSW Cooling Tower Pump House Pump Rooms The SSW cooling tower pump house pump rooms ventilation
(--
subsystem consist of two 100 percent capacity supply fans for each pump room utilizing separate ducting, dampers, and controls to maintain the space design temperature as listed in   Table 9.4-1.       Each pump room ventilation system is connected to the emergency bus which serves the pumps tha; are being cooled.         In this manner,     the associated fan operates when its respective pump is             operating,   and operation is assured in the event of the loss of offsite power supply. Ventilation air is exhausted through missile iand tornado protected openings.
INSERT B           p 9.4.5.2.3.2     SSW Cooling Tower Pump House Switchgear Rooms
           'The    SSW     cooling    tower    pump house switchgear rooms ventilation subsystem is shown in Fig. 9.4-6b.         The major system     components    and performance    data  are  listed in Table 9.4-8.
The    SSW     cooling    tower    pump house switchgear rocms ventilation subsystem consists of two 100-percent capacity supply fans for each switchgear room utilizing separate ducting, dampers, and controls to maintain the space design temperature      of    1090F    maximum. Each switchgear room ventilation system is connected to the emergency bus which serves the switchgear.         In this manner, the associated fan 9.4-47

INSERT A (Tor Page 9.4-47)
Unit heaters are provided in each diesel generator rotm to maintain the minimum design temperature for the areas during conditions of low outside arbient temperature.
1

T INSERT B (For Page 9.4-47)
Each pump room is supplied with an electric unit heater in order to maintain the minimum design temperature.
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Y RBS FSAB operates when its respective switchgear is operating, and operation is assured in the event of the loss of offsite power supply. Ventilation air is exhausted through missile and tornado protected openings.
INSERT C-              T 9.4.5.2.4      Auxiliary Building Ventilation System (Safety-Related Pump Rooms and Standby Gas Treatment)
For   a      description                   of the safety-related pump rooms ventilation subsystems see Section 9.4.3. For a description
* of the standby gas treatment subsystem see Section 6.5.
9.4.5.2.5      Annulus Mixing System                                                                         <-
For   a      description                  of   the        annulus           mixing          system    see Section 9.4.6.
9.4.5.2.6      Containment Ventilation System For a description of the containment ventilaticn system ree section 9.4.6.
9.4.5.2.7      Fuel Building Ventilation System (Charcoal Filtration Subsystem)
For a description                      of    the        charcoal       filter subsystem see
           . Section 9.4-.2.
9.4.5.3     Safety Evaluation The equipment which forms part of the ESF ventilation systems must maintain functional integrity during a DEA.
Therefore, the ventilation and air conditioning equipment and all associated ductwork and piping for these areas is designed to Seismic Category I requirements.                                                                    -
All   equipment                     is    located          within Seismic Category I structures. Redundant components are provided to ensure that a single failure does not impair or preclude systems operation. The systems are connected to the emergency power bus and are operable during less of offsite power.
The   safety evaluations of the control building, fuel building, auxiliary building, and containment ventilation systems and of the annulus mixing system are further discussed in the                       respective                sections               referenced      in Section 9.4.5.2 for these systems.
Each SSW cooling tower pump house pump rcom and SSW cooling tower pump room switchgear room is equipped with two 9.4-48                                                                _
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                       - ,     , - - , - - - , - -             . . . .     -- -       -~ . , - - . - ,         - - -  --- .      .-- -

(
INSERT C (For Page 9.4-48)
Each switchgear room is supplied with an electric unit heater in order to maintain the minimum design temperature.
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F RBS FSAR
('                                      TABLE 9.4-8                                      )
DESIGN CATA FOR THE ENGINEERED SAFETY FEATURES VENTILATION SYSTEMS Diesel Generator Rooms Exhaust Fans Equipment Mark No.         1HVP*FN2ASB, 1BVF*FN3ASB Type                        vaneaxial Capacity                    131,000 cfm Static pressure            3.5 in W.G.                        .-
Motor                       100 hp Equipment Mark No.         1HVP*FNSASB Type                        Vaneaxial Capacity                    34,000 cfm Static pressure             2.0 in W.G.
Motor                       20 hp Diesel Generator Control Rooms Supply Fans Equipment Mark Nc.         1HVP*FN6A, B, SC
(. ,F -           Type                        Centrifugal
(~                capacity                    2,000 cfm Static pressure            0.7 in W.G.
Motor                       1 hp INSERT         5 D
SSW Cooling Tower Pump House Fump Rooms Supply Fans
               -       Equipment Mark No.         1HVY*FN1A, 1B, 1C, S 1D Type                        Vaneaxial Capacity                    15,000 cfm Static pressure             2 in W.G.
Motor                       7.5 hp INSERT          ;_
E SSW Cooling Tower Switchgear Booms Supply Fans Equipment Mark No.         1HVY*FN2A, 2B, 2C, S 2D Type                        Vaneaxial Capacity                    6,200 cfm Static pressure             1.5 in W.G.
Notor                       3 hp INSERT           ;_
F 1 of 1

f INSERT D (For Table 9.4-8) 1 Diesel Generator Rooms Unit Heaters
      $quipment Mark No. 1HVP-UHIA & B & C, 1HVP-UH2A & B & C Type                   Electric Unit Heater Capacity               7.5 KW Equipment Mark No. 1HVP-UH3A, B & C,     ,
1HVP-UH4A, B & C      I Type                   Electric Unit Heater Capacity               5 KW

l INSERT E (For Table 9.4-8)
SFW Cooling Tower Pump House Pump Rooms Unit Heaters Equipment Mark No.                1HVY-UH17 & 18 Type                            Electric Unit Heater Capacity                         5 KW
                                                                     \
_ _ _ _ _ . _ . 1

I INSERT F (For Table 9.4-8)
SSW Cooling Tower Switchgear Rooms Unit Heaters Equipment Mark No.        1HVY-UH15 & 16 Type                      Electric Unit Heater Capacity                  4 KW

                                                             -- ~                                                                                                   -
c e                                                                    n t*,      RBS FSAR TABLE 9.4-1 (Cont)
Provision Operation     for Radia-Degree of       Under         tion moni-Yemperature    (* F)    Pressure (in W.G.[        Rel. rumidity (1)   ESF        Redundancy      Postulated toring at Normal      Post        Normal    Post            Normal    Post      Power      (Najor          Accident      Release HVAC System         Range       Accident Range        Accident        Range    Accident Required Components)         Conditions Poir,t          Remarks Auxiliary building  122 max     122 max    NA         NA               20-60    20-90     Yes        2-100% coolers  Yes           No           Recirculation type unit coolers          40 min      40 min                                                             for electrical,                            coolers cyItem                                                                                               mechanical                 ,
general area R;dwaste building     90-105    NA         -0.25      NA               20-60   NA         No         3-50% Exhaust   No            Yes          Sample room and tupply and exhaust    max                                                                            fans                                       Laundry room cyitems               40 min                                                                                                                    normal temp 75'T Ridwaste building     NA        NA           *.25
                                              ,       NA              NA       NA         No         2-1005 Filter   No            Yes          To provide filtra-chircoal filtra-                                                                                     unit & exhaust                             tion to radioactive tion system                                                                                          fans                                       tank ventilation discharge Turbine building      96-120    NA          -0.125    NA               20-60    N%        No         3-50% Exhaust   No            Yes          Sample room 75'F cupply and exhaust    max                                                                            fans                                       normal e:yttem               40 min Off gas-condensate    O to -40 NA           -0.25     NA               100 mar NA         No         2-100%          No            Yes dnsineralizer area vintilation systes Hogging pumps         NA        NA          NA        NA               NA       NA        NA         2-100%          No            Yes          To provide filtra-chtrcoal filtra-                                                                                                                                tion to radioactive tien system                                                                                                                                     hogging pump dis-charge Dissel generator     122 max     122 max    Atmos. Atmos.           20-90    20-90     Yes        2-100%          Yes           No           122*F based on vintilation system    40 min      40 min                                                             & HPCS                                     diesel engine running Switchgear and            max         max   Atmos. Atmos,             max      max    Yes        2-1005          Yes           No trsnsformer room      40 min      40 min etsndty service witer cooling tower vIntilation system Standty service      109 max     109 mas    Atmos. Atmos.          100 max 100 max    Yes        2-1005          Yes           No witer gump house      40 min      40 min vintilaticn system 2 of 3
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