ML20237F743
| ML20237F743 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 04/29/1987 |
| From: | SARGENT & LUNDY, INC. |
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| ML20237F603 | List: |
| References | |
| NUDOCS 8708210555 | |
| Download: ML20237F743 (412) | |
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Commonwealth Edison Company April 29, 1987 ) Zion Station - Units 1 and 2 Project 7805-00 ' EVALUATION OF THE CONTROL ROOM HVAC SYSTEM-PV AND THE COMPUTER ROOM, AUXILIARY ELECTRIC EQUIPMENT ROOM AND MISCELLANEOUS ROOMS HVAC SYSTEM-0V b) v e,oem osse e7e m l PDR ADOCK0500g5 P
SARGENT & LUNDY l 3 (V Connonwealth Edison Company for Consents April 29, 1987 1 Zion Station - Units 1 and 2 Project 7805-00 Table of Contents 1.0 Purpose 2.0 Summary of Conclusions 3.0 Design Intent of the PV and OV HVAC Systems and Mode of Operation at the Time of the Incident 4.0 Results of: 4.1 Configuration and Instrumentation Walkdown 4.2 Relief Damper Leakage Calculation and Field Measurements 4.3 Technical Support Center Modification Test Procedures Review 4.4 Review of Zion with Respect to Recent Trojan IE Notices 5.0 Evaluation of PV and OV HVAC Systems and Recommendations for Modification 6.0 Reference Documents 7.0 Cost Estimates to Implement the Recommendations for Modification 4 Attachments I A- A Simplified Composite P&ID of the PV & OV HVAC Systems and a j General Arrangement of the Areas Served by the PV and OV HVAC Systems B- Detailed Review of Zion with Respect to Recent Trojan IE and EA i Notices i C- Isometric Sketch of PV Relief Damper Configurations D- Marked Up Drawings Showing Results of Configuration Walkdown l I 1 l
i SARGENT S LUNDY
/' for Comments b Commonwealth Edison Company April 29, 1987 i l
Zion Station - Units 1 and 2 Project 7805-00 1.0 PURPOSE The purpose of this report is to present the results of Sargent & Lundy's (S&L) configuration and instrumentation walkdown and evalua-tion of Zion Station's PV (Control Room) and OV (Computer Rooms, Auxiliary Electrical Equipment Room, Miscellaneous Rooms) HVAC Systems. The walkdown and evaluation were requested by CECO-SNED at t the September 17, 1986, meeting at Zion Station (Reference 6.1). i The walkdown and evaluation were requested because of an incident that ! released contaminated gas into the Auxiliary Building. Station I personnel hypothesized that the contaminated gas was drawn into the PV f and OV HVAC Systems and distributed to the Control Room and the ; Technical Support Center (TSC). See Docket No. 05000295 Zion Licensee f e- Event Report (LER) No. 86-035-00 for further details (Reference 6.6). This report presents the following:
- Results of the configuration and instrumentation walkdown of
> the PV and OV HVAC System. This verified the relative location of components and duct branches in the PV and OV Systems. The walkdown also included a limited walkdown of PV and OV System pressure control and indication instrumentation. Results of a calculation and of field measurements of the amount of unfiltered auxiliary building air induced into the PV and OV Systems through the relief dampers.
- Results of a review of the TSC Modification Pre-Operational Test Procedures and recommendations for further tests to verify that the TSC Modification as installed is cdpable of meeting its design intent.
- Results of a review of the Zion Systems with respect to recent issues at Trojan and identification of conditions at Zion similar to the conditions reported at Trojan.
Evaluation of and recommendations for modifications to the PV and OV Systems with respect to isolating and pressurizing the Control Room and the 642 Elevation of the OV System.
SARGENT& LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 2.0
SUMMARY
OF CONCLUSIONS ; 1 The PV and OV Systems were evaluated with respect to three criteria:
- 1) During abnormal operation, makeup' air to the systems is required to be supplied through the makeup air filter units exclusively.
- 2) During abnormal operation, the PV and OV Systems are to be isolated from each other and from the normal outside air inlet path.
- 3) The systems are to pressurize their respective service areas (i.e., the Control Room and the 642 Elevation of the OV System).
2.1 Criteria 1, Unfiltered Inleakage Section 4.1.8 discusses the leakage of unfiltered air into the PV Sys-tem. Section 5.1 discusses the leakage of unfiltered air into the OV System. It is recommended that the PV relief dampers be permanently blanked off or replaced with bubble-tight dampers. If the PV relief dampers are blanked off or the OV bubble-tight relief damper perma-nently closed (as discussed in Section 5.1), the economizer controls should be deleted as discussed in Section 5.6. Section 5.1 also rec-ommends the implementation of means to assure only one 0V train oper-ates in the abnormal mode. It is also recommended that field measure-ments be taken, the 0V System be evaluated, and the system be balanced { as required. Section 5.10 discusses the possibility of unfiltered ) leakage into filter units and air-handling units through drains. It is recommended that all the relevant drains be evaluated. Section 5.11 discusses the possibility of unfiltered inleakage through the Outer Cable Spreading Room return duct isolation damper 0FCV-0V-105. Further evaluation is recommended. O 1 1
SARGENT S LUNDY For Coments k ' Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 2.2 Criteria 2, Isolation Section 5.2 discusses isolation of both systems from the normal out-side air inlet path. Section 5.3 discusses redundancy and leaktight-ness in the OV System pressurized boundary isolation dampers. Section 5.4 discusses leakage past isolation dampers which compromises the isolation of the systems from each other. In Sections 5.2, 5.3, and 5.4, further review is recommended to assess the need for additional and/or replacement dampers. Section 5.5 recommends that the 0V Lab Hoods Supply Fan b* stopped when the out-side air path is isolated, or that a separats outi.ide air path be provided for the fan. 2.3 Criteria 3, Pressurization Both systems currently control and indicate pressure in the areas served with respect to the Turbine BLilding and the Auxiliary Build-ing. Section 5.7 recommends that Control Room and TSC pressures be ) indicated with respect to the Turbine Building via new sensing lines into the Turbine Building. It is also recommended that PV and OV Systems be balanced to maintain the proper pressures. Section 5.8 discusses the effect on Control Room pressure of the door between the Control Room and the TSC. It is recommended that field measurements and evaluation of the 0V System include an assessment of the conse-quences of door position on room pressure. Section 5.9 discusses the lack of pressurization in the 642 Elevation OV System boundary. Field measurements, evaluation and balancing of the OV System are recom-mended. O
.__________ ____- ______ a
SANGENT& LUNDY i
- ( For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 l 3.0 - DESIGN INTENT OF THE PV AND OV HVAC SYSTEMS AND MODE OF OPERATION AT j THE TIME OF THE~ INCIDENT
-Attachment A includes a simplified composite flow diagram of the PV l and OV Systems. Also included is a sketch showing the general arrangement of the areas served by these systems. The following is a brief description of each system.
3.1 Control Room (PV) HVAC System , 1 For a detailed description of the PV System, see Functional Descrip-tion FD-PV-01, Reference 6.7.1. In all-modes of operation, air is supplied to the control room by one of two 100% Air-Handling Units OPV009-0A or OPV010-08. Air is returned from the control room by one of two 100% Return Fans (OPV011-0A or OPV012-08). 3.1.1 Normal Operation j A minimum quantity of makeup air is continuously supplied to maintain a positive pressure in the control room. During normal operation, makeup air is taken from the outdoors. When outdoor conditions permit, up to 100% outdoor air may be supplied to the control room to satisfy cooling requirements. When the quantity of outside air supplied to the PV system is in excess of We minimum makeup air required, the excess air is released to the Auxiliary Building through one of two 100% relief dampers OPDV-PV-20A or OPDV-PV-208 located downstream of the return fans. 3.1.2 Abnormal Operation If high radiation is detected in the outside air intake, or if safety i injection is initiated, the outside air path is isolated by dampers 0FCV-PV-39 and 0FCV-PV-11A. Makeup air is then taken from the turbine building and drawn through the control room makeup filter unit OPV005 by one of two 100% makeup filter unit fans OPV015-0A or OPV016-08.
SARGENT S LUNDY For Coments , Commonwealth Edison Company April 29, 1987 l Zion Station - Units 1 and 2 Project 7805-00 4 The air is then fed to the operating air-handling unit, and finally to the Control Room. l 3.2 Computer Rooms, Auxiliary Electrical Rooms and Miscellaneous Rooms (0V) HVAC System For a detailed description of the 0V System, see Functional Descrip-tions FO-0V-01, FD-0V-02 and FD-0V-03, (References 6.7.2, 6.7.3 and 6.7.4). In summary, the major components of the OV System (Reference 6.7.2) consist of two 50% equipment trains. The equipment trains consist of supply Air Handling Units 00V001-0A and 00V002-08 and Return Fans 00V003-0A and 00V004-08. Normally, both trains operate serving floor Elevations 642 and 630/617. [ 3.2.1 Normal Operation a) A minimum quantity of makeup air is continuously supplied to maintain a positive pressure in the areas served with respect to adjac?nt areas of the auxiliary building and turbine building to prevent inleakage. During normal operation, makeup air is taken from the outdoors. When outdoor conditions permit, up to 100% outdoor air may be supplied to satisfy the different rooms' cooling require-ments. When the quantity of outside air supplied to the OV System is in excess of the minimum makeup air the OV System requires, the excess air is released to the auxiliary building through relief damper OPDV-0V-14 and bubble-tight damper 0FCV-0V-102, located in series, downstream of the return fans. b) During normal operation, air from the battery rooms, kit-chen and toilet on Elevation 642 and the cold lab, and decontamination room on Elevation 617 is exhausted through one of two 100% Exhaust Fans 00V007-0A or 00V008-08 to the auxiliary building exhaust duct, and then to the stack. Air from the hot lab on Elevation 617 is exhausted through Filter Unit 00V048 by one of two 100% Fans 00V050 or 00V051 to the containment purge exhaust duct and out the stack. c) During normal operation, Lab Hood Supply Fan 00V049
) supplies outside air to the hot and cold lab hoods.
I SARGENTS LUNDY For Connents (V9 Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 d) Counting room air conditioning unit 00V065 mixes 200 cfm of makeup air from the turbine building with return air and supplies the counting room on Elevation 617. This main-tains a positive pressure in the counting room with respect to the adjacent corridor. The radiation offices are sup-plied by the OV System and by a 100% recirculation unit. 3.2.2 Abnormal Operation a) If high radiation is detected in the outside air intake, the outside air path is isolated by damper 0FCV-PV-11B and bubble-tight damper 0FCV-PV-39. Elevation 630/617 is isolated by dampers 0FCV-0V-103, 0FCV-0V-104, 0FCV-0V-63A, and 0FCV-0V-638. In this mode, the system operates as two 100% equipment trains, both of which are available to serve elevation 642, but only one'of which will operate at any given time. Makeup air is taken from the turbine building through the TSC Makeup Filter Unit Fan 00V057, Filter Unit 00V056, and on to the operating air-handling unit. b) When the TSC filter unit fan starts, exhaust from the kitchen and toilet is isolated by dampers 0FCV-0V-97 and 0FCV-0V-98. Also, the source of battery room makeup air is switched from the auxiliary electrical equipment rooms which are within the OV pressurized boundary to the M-G set rooms which are outside the OV pressurized boundary by . closing dampers 0FCV-0V-93 and 0FCV-0V-96 and opening dampers 0FCV-0V-91 and 0FCV-0V-94. c) When high radiation is detected in the outside air intake, the outside air path for the Lab Hood Supply Fan 00V049 is isolated by damper 0FCV-PV-11C. d) The radiation office and counting room are part of the 617 Elevation which is isolated from the 0V System during the abnormal mode. The A/C units in the radiation office and counting room are independent of the OV System and operate in accordance with their room thermostats. The A/C units are not required to operate in case of an accident. l 3.3 Mode of PV and OV Operation at the Time of the Incident At the time of the incident the PV System was in the abnormal opera-ting mode (Section 3.1.2). The outside air path, which is common to O 4 the PV and OV Systems, was isolated and the Control Room Makeup Air 1 SARGENT S LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Filter Unit Fan was operating. Abnormal operation was not induced by a high radiation signal, but rather by manual adjustments. These manual adjustments were made pending completion of a system modification. i Because no high radiation signal existed, the OV System continued to operate in its normal mode with the exception of the outside air path being isolated. The TSC Makeup Air Filter Unit Fan was not operating and, therefore, the 0V System was left without a source of makeup air. As per normal operation, (Section 3.2.1), the OV System was operating as two 50% equipment trains, one train serving the 642 Elevation and the other serving the 630/617 Elevation. Air from the battery rooms, kitchen, and toilet on Elevation 642 was being A exhausted out the stack. Air from the Hot Lab on Elevation 617 was O being exhausted through Filter Unit 00V048 out the stack. The lab hood supply fan, 00V049, was attempting to supply outside air to the hot and cold lab hoods even though the outside air path was iso-lated. This situation caused negative pressure in portions of the 0V duct work which should have been at positive pressure. i 1
1 SARGENTE LUNDY (') v Commonwealth Edison Company For Coments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.0 RESULTS OF: The following Sections, 4.1 through 4.4, present the results of the { Configuration and Instrumentation Walkdown, Relief Damper Leakage Calculation and Field Measurements, TSC Modification Test Procedure Review, and Review of Zion with Respect to Recent Trojan IE Notices. Recommendations regarding these issues are presented in Section 5. 4.1 Configuration and Instrumentation Walkdown A configuration walkdown of the Zion PV and OV HVAC Systems was performed the week of September 22, 1986. The results were compared against the P& ids and physical drawings (Reference 6.13), to verify the relative location of HVAC components with respect to other components and duct branches. The term " components" includes isola-tion dampers, modulation dampers, manual balancing dampers, fans, filters, coils, mixing boxes, and humidifiers. The as-found position of manual balancing damper blades was also noted as " percent open." The walkdown included the instrumentation which senses, controls, and indicates Control Room and Computer Room pressure relative to the Auxiliary Building and the Turbine Building. The results of the walkdown have been noted on the drawings and in-cluded as Attachment D. The results are evaluated in terms of the design requirements of isolating and providing filtered pressurization air for control room and the 642 Elevation of the OV System. 4.1.1 Mixing Boxes 00V045 and 00V034 a) P&ID No. M77, Sheet 1, Revision AE: I Mixing Boxes 00V045 and 00V034 serving the HVAC Equipment Room and the Outer Cable Spreading Room are shown tapping f into the main OV supply ducts upstream of isolation dampers 0FCV-0V-103 and 0FCV-0V-104. 1 SARGENT E LUNDY I For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 , b) Physical Drawing No. M318, Revision AC: Mixing Boxes 00V045 and 00V034 are shown tapping into the main OV supply ducts downstream of isolation dampers 0FCV-0V-103 and 0FCV-0V-104. c) Walkdown Results: Physical Drawing No. M318, Revision AC, shows the as-built configuration. d) Comments: The as-built configuration is consistent with the design intent of isolating the 630/617 Elevation of the OV System in abnormal operation. 4.1.2 Inner and Outer Cable Spreading Room Return Duct a) P&ID Drawing No. M77, Sheet 1, Revision AE: The inner cable spreading room return duct is shown tieing into the outer cable spreading room return duct which ties into the OV System 642 Elevation return duct. b) Physical Drawing Nos. M315, Revision K, M316, Revision S, and M317, Sheet 1, Revision AC: The inner cable spreading room return duct is shown tieing into the OV System 617 Elevation return duct. The outer cable spreading room return duct is shown tieing into the OV System 642 Elevation return duct. c) Walkdown Results: Physical Drawing Nos. M315, Revision K, M316, Revision S, and M317, Sheet 1, Revision AC, show the as-built configuration. d) Comments: The as-built configuration of the inner cable spreading room return duct is per the design intent of isolating the
. cable spreading room (630 Elevation) from the 642 Elevation
( OV System in abnormal operation. Isolation is achieved by bubble-tight isolation damper 0FCV-0V-99.
SARGENT & LUNDY G V Commonwealth Edison Company For Consnents April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 The as-built configuration of the outer cable spreading room return duct needs further evaluation. See Section 5.11. 4.1.3 Unit 2 Battery Rooms Exhaust Duct a) P&ID No. M77, Sheet 1, Revision AE: The Unit 2 battery room's exhaust duct is shown tieing into the kitchen, toilet, and Unit 1 battery room's exhaust duct. b) Physical Drawing Nos. M316, Revision S, M317, Sheet 1, Revision AC, M318, Revision AC: The kitchen, toilet, and Unit 1 battery room's exhaust duct is shown tieing into the Cold Lab exhaust; this combination is then shown tieing into the decontamination room exhaust. The Unit 2 battery room's exhaust duct then ties .' into this combination. c) Walkdown Results: Physical Drawing Nos. M316, Pevision S, M317, Sheet 1, Revision AC, M318, Revision AC, show the as-built configuration. d) Comments: The as-built configuration is consistent with the design , intent of not exhausting air from the 642 Elevation pres- 1 surized boundary in abnormal operation. Although there is 1 a difference between the P&ID and the as-built configura- l tion, both configurations are functionally acceptable. { j 4.1.4 Radiation Offices HVAC Unit a) P&ID Drawing No. M77, Sheet 1, Revision AE: The drawing does not show the 4000 cfm recirculating unit i 1 which serves the radiation offices. 4 b) Physical Drawing No. 316, Revision S: The drawing shows a 4000 cfm recirculating unit which serves the radiation offices.
SARGENTS LUNDY ('N for Comments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 c) Walkdown Results: A 4000 cfm recirculating unit serves the radiation offices. d) Comments: Since the 4000 cfm unit serving the radiation offices is a recirculating unit which does not interact with the 0V and PV Systems, the as-built configuration is acceptable. 4.1.5 Shift Engineers Office and Prime Computer Room a) P&ID No. M77, Sheet 1, Revision AE: The drawing shows the Shift Engineers Office with 800 cfm supply and exhaust separated from the Prime Computer Room by a wall. Mixing box 00V031 is shown supplying 300 cfm to the Prime Computer Room. A 300 cfm return duct is located p in the Prime Computer Room. tW" l b) Physical Drawing No. M317, Sheet 1, Revision AC: ! Same as P&ID. c) Walkdown Results: The Shift Engineers Office and its 800 cfm supply and re-turn are now part of the Prime Computer Room. A portion of l the Prime Computer Room is now partitioned by a wall and closed door creating a new office. This office is supplied with 300 cfm by mixing box 00V031. The return for this 300 cfm is still in the Prime Computer Room. d) Comments: The as-built configuration results in an imbalance in the ducted supply and return in the Prime Computer Room and the Office. 800 cfm is being supplied to the Prime Computer Room with 1100 cfm being returned. 300 cfm is being supplied to the office with no return. For the resolution of these concerns, see Reference 6.16, Recommendations j, k, and 1. O 3
SARGENT & LUNDY I For Coments . Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.1.6 File and Hot Instrument Rooms a) P&ID No. M77, Sheet 1, Revision AE: The Radiation Room, File Room, and Hot Instrument Room are shown as separate rooms. b) Fhysical Drawing M316, Revision S: Same as P&ID. c) Walkdown Results: The File Room and Hot Instrument Room are now part of the Radiation Room. d) Comments: I Regardless of the arrangement, these areas of the plant are j isolated from the 642 Elevation OV System in abnormal [] operation as is the design intent. v 4.1.7 Counting Room A/C Unit a) P&ID No. M77, Sheet 2, Revision H: The new Counting Room A/C unit number is shown as 00V052. b) Physical Drawing No. M316, Revision S: The new Counting Room A/C unit number is shown as 00V065. c) Walkdown Results: The Physical Drawing No. M316, Revision S, shows the correct new Counting Room A/C unit number. d) Comments: ; No effect on the design intent. l l O j
l SARGENT& LUNDY O V For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.1.8 PV Relief Dampers and Associated Ductwork (See Attachment C1 a) P&ID, No. M81, Revision V4: Isolation dampers 0FCV-PV-06A and 0FCV-PV-05A are on the exhaust sides of the two 100% capacity redundant return fans OPV012-0B and OPV0ll-0A. Following these two dampers, the two separate ducts join together. A relief duct branches off and then two PV relief dampers, in series, are located in the relief duct branch. b) Physical Drawing No. M318, Revision AC: Section D-D shows the same configuration as the P&ID with one exception. Instead of two PV relief dampers, one 24" x 60" relief damper labeled OPDV-PV-20 is shown. A 24" x 36" duct leading to the relief damper downstream of isolation dampers 0FCV-PV-06A and 0FCV-PV-05A is shown. A 24" x 60" plenum is shown downstream of return fans OPV012-0B and OPV011-0A. O tg c) Walkdown Results: Return fans OPV012-08 and OPV011-0A feed directly into two separate 24" x 30" ducts. In contrast to the P&IO and physical drawing, the ducts drop down to the relief dampers and rise up to the isolation dampers. The two relief dam-pers are 24" x 30". Above the isolation dampers, the two separate 24" x 30" ducts merge to become the PV system return duct leading to the air handlers. In summary, the relief dampers are not in series with the isolation dam-pers, but rather are in parallel with them, d) Comments: The return fans are two 100% capacity redundant fans. The inlets to the two fans are connected with no isolation damper between them. Thus, when one fan is operating, the space up to the relief damper and isolation damper asso-ciated with the non-operating return fan is drawn nega-tive. Since the space below the relief damper is the i auxiliary building, relief damper leakage will draw auxiliary building air through the damper, the nonoperating fan, the operating return fan, and on to the operating air-handling unit which supplies the control room. For an estimate and field measurements of unfiltered Auxiliary O Building air that is drawn into the PV system, see Section b 4.2. For evaluation and recommendations, see Section 5.1. 1
SARGENT & LUNDY Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.1.9 Outside Air Intake Duct a) P&ID No. M81, Revision V4: The outside air intake duct is shown to have two dampers in series, 0FCV-PV-39 and 0FCV-PV-11A. b) Physical Drawing No. M382, Sheet 1, Revision AH: Same as P&lD. c) Walkdown Evaluation: Bubble-tight damper 0FCV-PV-39 is as shown on the above drawings. Isolation damper 0FCV-PV-11A was inaccessible (see comments for explanation). d) Comments: 1 Subsequent to S&L's walkdown, Zion Tech Staff indicated I that an instrument air line penetrates the outside air duct. The instrument air line can be seen from the Unit 2 purge room. It is believed that the instrument air line is supplying air to the operator for Isolation Damper CFCV-PV-11A. 4.1.10 Fire Damper OTSV-0V-0085 a) P&ID No, M81, Revision V4: Fire. damper OTSV-0V-0085 is shown between the inlets to return fans OPV011-0A and OPV012-0B. b) Physical Drawing No. M318 Revision AC: Fire damper OTSV-0V-0085 is shown upstream of both return fan inlets. c) Walkdown Results: Physical Drawing No. M318, Revision AC, shows the as-built configuration, d) Comments: q No effect on the design intent. o ! SARGENT S LUNDY for Coments Commonwealth Edison Company April 29, 1987 Z'on Station - Units 1 and 2 Project 7805-00 4.1.11 Return Air Duct to Air Handler OPV010-0B a) P&ID No. M81, Revision V4: The return air duct to air-handling unit OPV010-0B is shown intersecting the abnormal operation makeup air duct. b) Physical Drawing No. M318, Revision AC: The return air duct to air-handling unit OPV010-08 is shown not intersecting the abnormal operation makeup air duct. c) Walkdown Results: Physical Drawing No. M318 Revision AC shows the as-built configuration. d) Comments: Since it was not the design intent that these ducts intersect, the as-built configuration is consistent with to the design intent. ; 4.1.12 Radiation Offices Return Air Register a) P&ID - NA b) Physical Drawing No. M316, Revision S: A 12" x 12" return air register which returns air from the Radiation Offices to the ceiling plenum is shown. - s c) Walkdown Results: The return air register mentioned above does not exist. d) Comments: Because other return air registers are present in the Radiation Offices, the as-built condition is acceptable.
1 l SARGENT & LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 l 4.1.13 Isolation Damper 0FCV-0V-91 1 a) P&ID No. M77, Sheet 1, Revision AE: Isolation damper 0FCV-0V-91 is shown in the Battery Room 1A supply duct which comes from the M.G. Set Room. b) Physical Drawing No. M317, Revision AC: The above mentioned damper is not shown on the drawing, c) Walkdown Results: P&ID No. M77, Sheet 1, Revision shows the as-built config-uration. d) Comments: ! The as-built configuration is consistent with the design intent. (See 3.2.2b) O V 4.1.14 Mixing Box 00V030 Flexible Duct a) P&lD No. M77, Sheet 1, Revision AE: The flexible ducts leading to Mixing Box 00V030 are shown blanked off. b) Physical Drawing No. M317, Revision AC: No Comments. c) Walkdown Results: The flexible ducts leading to Mixing Box 00V030 were re-moved. d) Comments: The as-built configuration is consistent with the design intent. F
1 l l l t 1 SARGENT A LUNDY For Coments 1 Commonwealth Edison Company April 29, 1987 l Zion Station - Units 1 and 2 Project 7805-00 ' 4.1.15 Dampers 0FCV-PV-24A, OFCV-PV-248, OFCV-PV-28A and 0FCV-PV-288 a) P&l0 No. M81,' Revision V4-l The dampers are correctly shown as follows: ) 0FCV-PV-24A - A/H OPV009-0A return air damper ! 0FCV-PV-24B - A/H OPV009-0A outside air damper j 0FCV-PV-28A - A/H OPV009-0A charcoal filter bypass damper 4 0FCV-PV-28B - A/H OPV009-0A charcoal filter face damper b) Physical Drawing No. M318 Revision AE: h HbV0 OB c) Walkdown Results: P&ID No. M81, Revision V4, shows the as-built configura-tion. d) Comments: Although Section B-B on the physical drawing is a section of A/H OPV010-08, the intent was to make it a typical sec-tion showing both A/H OPV009-0A and A/H OPV010-0B. That is why the dampers for both units were shown in the section view. 4.1.16 Decontamination Room Exhaust and Exhaust Filter Unit 00V011 a) P&ID No. M77, Sheet 1, Revision AE: Not applicable. b) Physical Drawing No. M318, Revision AE: The Decontamination Room exhaust and exhaust filter unit 00V011 are shown above A/H OPV009-0A and up against the ceiling. O
SARGENT & LUNDY f) For Coments v Commonwealth. Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 c) Walkdown Results: The as-built location of the decontamination room exhaust. and exhaust filter unit 00V011 is just east of Exhaust Fans 00V007-0A and 00V008-0B, and approximately four feet off .j the floor. I d) Comments: The as-built configuration is consistent with the design intent. (This item was not in the scope of the walkdown.) ' 4.1.17 Mixing Boxes 00V036 and 00V039 a) P&ID No. M77, Sheet 1, Revision AE: Mixing box 00V036 is shown supplying 870 cfm to the hall-way, upstream of mixing box 00V039. Mixing box 00V039 is shown supplying 800 cfm to the hallway, downstream of mix-ing box 00V036. b) Physical Drawing No. M316, Revision S: Mixing box 00V036 is shown supplying 870 cfm to the hall-way, downstream of mixing box 00V039. Mixing box 00V039 is shown supplying 800 cfm to the hallway, upstream of mixing box 00V036. c) Walkdown Results: , i Physical Drawing No. M316, Revision S, shows the as-built I configuration. d) Comments: The as-built configuration is consistent with the design intent. I 4.1.18 Hot Lab Exhaust Ducts a) P&ID No, M77, Sheet 1, Revision AE: No Comments. I J l
l SARGENT & LUNDY V,ey for Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 ] i b) Physical Drawing No. M316, Revision S: ) I No Comments. j c) Walkdown Results: There are two ducts not shown on the physical drawing which exhaust air out of the hot lab. d) Comments: The additional ducts tie into a hot lab exhaust duct which is shown on the physical drawing; therefore, the as-built configuration is consistent with the design intent. 4.1.19 Dampers 0FCV-PV-28A and 0FCV-PV-288 a) P&lD No. M81, Revision V4: Dampers 0FCV-PV-28A and 0FCV-PV-288 are shown as the face and bypass dampers for Air-Handling Unit OPV009-0A. b) Physical Drawing No. M318, Revision AE: Dampers 0FCV-PV-28A and 0FCV-PV-288 are shown in the PV system return duct to Air-Handling Unit OPV010-08. c) Walkdown Evaluation: The P&lD shows the as-built configuration, d) Comments: l The as-built configuration is consistent with the design intent. i l SARGENT5 LUNDY i For Comments
' Consnonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 i 4.1.20 Control Room Pressure Control Instrumentation l The instrumentation which senses Control Room pressure relative to the Auxiliary Building and the Turbine Building and controls the pressure control dampers was included in the walkdown (see drawing M81 coordi- ,
nates C/8-6/7). Pressure controller OPDC-PV20 sends a 0 psi signal per design when the Control Room pressure is less than +0.25 in. H2 0. Since the controller was putting out the correct signal, and since the pressure control instrumentation may be disabled (see Section 5.6), it was not verified that each instrument was operating and was piped correctly. Pressure control relay 0XY-0V20B was found in panel OLP19. The one output signal from the relay divides into two separate paths. One path leads to solenoid valve OSV-PV20B for relief damper OPDV-PV20B. (~ V The other path leads out of panel OLP19 where it joins with many other tubes in a tube bundle and therefore could not be further traced. To pursue this issue further would require disconnecting the tubing from the instrumentation and the relief dampers, blowing air into one end of the tubing, and observing air movement out the other end. Since . the relief dampers may be blanked off and the pressure control instru-mentation may be disabled (see Section 5.6), this issue was not pur-sued any further. 4.1.21 OV System Pressure Control Instrumentation The instrumentation which senses Computer Room pressure relative to the Auxiliary Building and the Turbine Building and Controls the OV relief damper OPDV-0V-14 was included in the walkdown. (See drawing M-77, sheet 1, coordinates A-8.) Pressure controller OPDC-0V14 was observed at 0 psi signal as required by design when the Computer Room pressure is less than + 0.25 in. H 0. p Since the controller was putting out the correct signal, and since the pressure control instru-d I
SARGENT & LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 mentation may be disabled (see Section 5.6), it was not verified that each instrument was operating and piped correctly. ' 6 4.2 Relief Damper leakage Calculation and Field Measurements A calculation has been prepared to estimate the amount of air drawn into the PV and OV systems from the Auxiliary Building through dampers OPDV-PV-20 and OPDV-0V-14 respectively (Reference 6.17.1). This calculation provides a relative estimate only since it is based on the indicated assumptions, walkdown results, and other immediately avail-able information. l For PV system relief damper OPDV-PV-20, the assumption used is that the damper leakage characteristics are equivalent to the damper manu-facturer's typical data for a damper without blade or jamb seals. Also, the pressure differential across the damper is assumed to be 1 in. H 20. The results of the calculation indicate that approximately 550 scfm of unfiltered Auxiliary Building air is leaking into the PV system through damper OPDV-PV-20 (nonoperating train). OV system relief damper 0FCV-0V-14 was in a partially open position and is a larger damper than OPDV-PV-20. Assuming that the pressure differential across the damper is 1 in. H 20, that the damper is 30* to 36" open, and assuming typical data for pressure loss for partially open dampers results in between 5,700 and 9,600 scfm of unfiltered Auxiliary Building air entering the 0V system. Subsequent to the relief damper leakage calculation, leakage through the PV and OV relief dampers was measured in the field with a hot wire anemometer. The results of the field measurements are included in Reference 6.17.2 and are summarized as follows: O SARGENT & LUNDY For Comments Commonwealth Edison Company April 29, 1987 Zion Station . Units 1 and 2 Project 7805-00 Leakage into the PV system through damper 0PDV-PV-20B with the A train running is 154 cfm. With the B train running, leakage into the PV system through damper OPDV-PV-20A is 236 cfm. The measured values are less than the calculated values primarily because the PV relief damp-ers had blade seals. The calculation assumed no blade seals. Leakage through damper OPDV-PV-20A is higher than OPOV-PV-20B because damper OPDV-PV-20A is missing the seal on one of its blades. Leakage into the OV system through damper OPDV-0V-14 was measured at 1679 cfm with hot wire anemometer measurements and at 1302 cfm with pitot tube traverse measurements. Note that the hot wire anemometer measurement is higher (more conservative) than the pitot tube traverse measurement. The measured values are less than calculated values pri-marily due to the actual versus the assumed pressure difference across the damper. The actual pressure differential was measured at 0.21 in. H2 0, where the calculation assumes a 1.0 in. H2 0 pressure differen-tial. Section 5.1 provides an evaluation and recommendations on this issue. 4.3 Technical Support Center Modification Test Procedures Review Review of test procedures indicates that the TSC portion of the OV system controls and interlocks is tested as designed. This procedure l should, however, include verification of the computer room isolation dampers' operation. Also, auxiliary electrical equipment room and battery room damper numbers are interchanged. The procedures should be supplemented by testing and balancing of the TSC system along with makeup filter unit testing (Reg. Guide 1.140 and ANSI N510) and veri-fication of the as-built system. Since the TSC is an integral part of the OV system during emergency mode, the 0V system should be tested and balanced in conjunction with the TSC system to verify overall sys-tem operation. Verification of area pressure (+1/8" water) with re-spect to nonhabitable areas should be included in the Test Procedures.
SARGENT & LUNDY For Comments Connonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.4 Review of Zion with Respect to Recent Trojan IE Notices A violation of HRC requirements was identified at the Trojan Nuclear Power Plant during a special inspection conducted by the NRC in early 1986. The violations were due to deficiencies found in the testing and operation of the control room ventilation system. The severity level and details on the fine are described in the NRC's " Notice of Violation and Propos- Imposition of Civil Penalty" EA 86-54. As a result of these violations, IE Information Notice (IEIN) No. 86-76 was issued. This IEIN describes, in detail, each of the problem areas found at the Trojan Control Room HVAC System. Attachment 8 provides an evaluation of how the Zion Nuclear Power Plant compares to the issues described in these EA and/or IE Infor-mation Notices. The issues described in the notices were reviewed against documents available such as P&lD, physical drawings, func-tional descriptions, FSAR and Technical Specifications (documents used are listed in Section 6), and walkdown observations. Some of the responses may require further verification by Commonwealth Edison Company since some of the information and documentation are not avail- . able to S&L (as noted in Attachment B). l Of the 10 issues evaluated in Attachment B, only two are potential I issues at Zion. The first issue is the drain line problem as discussed in issue 5 and the second issue is the pressure controller I problem as discussed in issue 8. The remainder of the issues are not l applicable to Zion or only require verification for compliance to the j Zion FSAR or Technical Specifications. O 1 l i l __ -___-__ - ___-__. _ 1
. SARGENT S LUNDY h- Commonwealth Edison Company For Coments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Issue 5 As discussed, the system drains have the potential for introducing possibly contaminated air into the system. They may also allow control room pressurization air to leak out of the system. This is one of the items that resulted in a proposed fine for the Trojan Plant. See Section 5.10 for Zion recommendations.
Issue 8 The method of measuring the control room pressure differential does not demonstrate that a positive pressure of 0.25 in. H 2O will be main-tained between the control room and all adjacent areas. This issue is discussed in detail in References 6.10 and 6.2. See Section 5.7 for recommendations for Zion. O u O
SARGENT & LUNDY O Commonwealth Edison Company For Comments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 5.0 EVALUATION OF PV AND OV HVAC SYSTEMS AND RECOMMENDATIONS FOR MODIFICATION 5.1 Relief Dampers Leakage of Auxiliary Building air into the PV System was described in Section 4.1.8. Walkdown observations indicated that the section of OV return duct above relief damper OPDV-0V-14 was at a negative pressure relative to the Auxiliary Building in the mixed mode of operation described in Section 3.3. Also, damper OPDV-0V-14 was partially open. Under these conditions, with bubble-tight damper 0FCV-0V-102 open, potentially contaminated Auxiliary Building air would be pulled into the 0V System. Leakage of Auxiliary Building air into the PV and OV Systems is unde-O sirable. In abnormal operation, this inleakage may increase the Con-trol Room and TSC radiation dose. The design requirement in abnormal operation is that the only makeup air added to the PV and OV Systems be through the PV and TSC Makeup Air Filter Units. Leakage through the PV relief dampers may be eliminated by one of two methods. The first is to permanently blank off the relief dampers. This would eliminate the PV economizer feature. The second method is to replace the existing relief dampers with new bubble-tight dampers which close when their associated return fan is not operating. This will require a total of four new bubble-tight dampers if redundancy is desired as determined by CECO per Recommendation 5.3. The second method will leave the PV economizer system intact. Leakage of Auxiliary Building air into the OV System was due to the mixed mode of operation as described in Section 3.3. Operation of the OV System in the abnormal mode as described in Section 3.2.2 with only L____-_--___---_---_--_----_-- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
SARGENT 5 LUNDY ( For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 one OV train operating results in a positive pressure in the 0V return duct above relief damper OPOV-0V-14. Per S&L discussions with Station personnel, there currently is no automatic feature nor a manual procedure to assure that only one OV train operates in abnormal operation. Means of assuring that only one OV train operates in abnormal operation should be implemented. Also, in series with OV relief damper OPOV-0V-14 is one bubble-tight damper 0FCV-0V-102. If redundancy is desired as determined by CECO per Recommendation 5.3, a second bubble-tight damper should be
'nstalled. An alternative to adding a second bubble-tight damper wou h' be to close the existing bubble-tight damper 0FCV-0V-102 and seal al leak paths around the damper. Note that this alternative would eli'inate the economizer feature of the OV System. If the damper is t.losed, future consideration should be given to its removal and blanking off t % opening.
Recommendation For the PV System, either permanently blank off the PV relief dampers OPOV-PV-20A and OPDV-PV-20B or replace the existing relief dampers with new bubble-tight dampers. For the 0V System, if redundancy is desired as determined by CECO per Recommendation 5.3, either add a new bubble-tight damper in series with 0FCV-0V-102 or permanently close the existing bubble-tight damper 0FCV-0V-102. Implement either auto-matic or manual means of assuring that only one 0V train operates in abnormal operation. 5.2 Normal Outside Air Duct Isolation Dampers The outside air intake for the PV and OV systems has two isolation e dampers in series. OFCV-PV-11A is the original isolation damper which SARGENT& LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7865-00 is not bubble-tight, is of unknown leakage, and was inaccessible I during the walkdown. 0FCV-PV-39 is a bubble-tight damper installed per the conclusion of Zion's Control Room Habitability Report to reduce leakage and ensure isolation redundancy in order to meet the full extent of NRC requirements set.forth in Item III.D.3.4 of NUREG- i 0737. Because damper 0FCV-PV-11A is not bubble-tight, even if it is in place and it isolates, failure of damper 0FCV-PV-39 to close due to mechanical failure will allow unfiltered outside air to leak into the PV system. This arrangement may not conform to the requirements of Standard Review Plan (SRP) 6.4, Sections II.2.a and II.2.b which are referenced in NUREG-0737 Item III.D.3.4 SRP 6.4, Section II.2a, states that
, dampers used to isolate the control zone from adjacent zones or the outside must be leaktight. SRP 6.4, Section II.2.b, states that single failure of an active component should not result in loss of the system's functional performance.
However, Section II.2.b also references Appendix A to SRP 6.4 which details acceptance criteria for a damper repair alternative. Credit for damper repair may be given when the following criteria are met: Internal components that are difficult to repair manually without opening the ductwork have a very low probability of failure. External components must be designed and tested to ensure that the failed component can be bypassed easily and safely and that the damper can be manipulated into an acceptable position. Location of the damper must permit easy access by the Control Room personnel. Control Room instrumentation should be provided for a clear indication and annunciation of damper malfunction. 1 Periodic manipulation of the damper and the controls by Control
\ Room personnel should be required for training purposes.
l SARGENT S LUNDY l / For Comments l- Commonwealth Edison Company April 29, 1987 I Zion Station - Units 1 and 2 Project 7805-00
- Compliance with the above criteria should be docuttented in the SAR whenever credit is taken for the repair option.
Recommendation Verify the existence, location, and operability of the original outside air isolation damper 0FCV-PV-11A. Provide for redundant bubble-tight outside air isolation if CECO determines it to be necessary per Recommendation 5.3. 5.3 OV System Pressurized Boundary Isolation Dampers SRP 6.4, Section II.2.a, states that dampers used to isolate the control zone from adjacent zones or the outside must be leaktight. SRP 6.4, Section II.2.b, states that single failure of an active component should not result in loss of the system's functional perfor-mance. SRP 6A , Section II.1, states that the control zone may include the Computer Rooms, the Shift Supervisor's Office, the kitchen, and the toilet. Finally, Zion's Control Room Habitability Report states that the Computer Rooms, kitchen, and toilet are maintained in a habitable state by the OV System. , Zion's Computer Rooms, kitchen, and toilet are served by the 642 Elevation OV System which is isolated and pressurized in abnormal operation. Isolation is accomplished by single dampers. Only three of the 0V System pressurized boundary isolation dampers are bubble-tight ~, the rest are high-quality low-leakage dampers. Dampers OFCV-0V-103 and 104 isolate the 630/617 Elevation supply. Bubble-tight dampers 0FCV-0V-99 and 105 isolate the 630/617 Elevation return. Damper 0FCV-0V-97 isolates the toilet exhaust and 0FCV-0V-98 isolates the kitchen exhaust. Dampers 0FCV-0V-93 and 96 isolate the Auxiliary O
1 1 SARGENT S LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Electrical Equipment Rooms from the Battery Room's exhaust. Bubble-tight damper 0FCV-PV-39 isolates the outside air path. Bubble-tight damper 0FCV-0V-102 isolates the relief path to the Auxiliary Building, i Single isolation dampers were originally acceptable based on the fact that they are fail closed pneumatic dampers. Loss of air or loss of power will close the dampers. However, mechanical failure or short i circuit could prevent them from failing closed. Recommendation Commonwealth Edison Company should review Zion licensing commitments to determine whether redundant dampers are required or single dampers ; are acceptable. This review will also determine whether bubble-tight dampers are required, or nonbubble-tight dampers are acceptable. 5.4 Isolation Between PV and OV Systems When high radiation is detected in the outside air path, the intent of the design is to isolate the PV System from the OV System and to start ' the makeup units to provide filtered pressurization air. An outside air duct connects the PV Air-Handling Units with the OV Air-Handling f Units. This path is isolated by damper 0FCV-PV-118 which is not a bubble-tight damper. Another outside air path connects the PV Air- J Handling Units to the Lab Hoods Supply Fan. This path is isolated downstream of the fan by damper 0FCV-PV-11C which is not a bubble-tight damper. 1 I Leakage past these isolation dampers is a loss of pressurization air from one or both of the systems. Leakage past damper 0FCV-PV-11C is either leakage out of the PV pressurized boundary or leakage of potentially contaminated air from the Hot and Cold Labs into the PV System. If leakage past damper 0FCV-PV-11B is leakage out of the 0V l 1 t - - - - . - - - _ _ - - - - - - - - _ - _ _
8ARGENTE LUNDY
!' For Comments Connonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 pressurized boundary into the PV pressurized boundary, any failure which causes the OV System to become contaminated will subsequently contaminate the PV System.
Recommendation
-Install either single or redundant (as determined by CECO per Recommendation 5.3) bubble-tight isolation dampers between the PV and OV Air-Handling Units and between the Hot and Cold La'o supply and the !
PV System. An alternative for the Hot and Cold Lab supply is to separate the outside air duct for the Hot and Cold Labs from the PV outside air duct upstream of bubble-tight isolation damper 0FCV-PV-39.
)
i 5.5 Trip of Hot and Cold Lab Supply Fan in Abnormal Operation When high radiation is detected in the outside air intake, outside air to the Hot and Cold Lab Supply Fan 00V049 is isolated by closing dampers 0FCV-PV-39 and 0FCV-PV-11A. Also, the discharge of Fan 00V049 is isolated by damper 0FCV-PV-11C. When the handswitch is in the auto position, however, Fan 00V049 operates when either or both OV Air-Handling Unit operates. Since one OV Air-Handling Unit continues to I, operate after detection of high radiation in the outside air intake, '! Fan 00V049 continues to operate even though outside air and the fan discharge have been isolated. Recommendation j 1 Modify the controls for Hot and Cold Lab Supply Fan 00V039 such that the fan stops when dampers 0FCV-PV-39, OFCV-PV-11A and OCCV-PV-11C isolate. If the alternative of providing a separate outside air duct for the Hot and Cold Labs is chosen, it will not be necessary to stop - Supply Fan 00V049 when the PV and OV Systems are in abnormal j l operation. _ _ _ _ _ _ _ - . _____--_________---_-__-_______D
S A R G E N T S I.U N D Y For Comments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 5.6 Deletion of PV and OV Economizer Control Currently, both the PV and OV Systems have economizer capability which means that when outdoor conditions permit, up to 100% outdoor air may be supplied to satisfy cooling requirements. To take in 100% outside air, the outside air damper on the inlet to the air-handling units would open 100%, the return air dampers would close so that no air returns to tne air-handling units and the relief dampers would open 100% to relieve all the air out of the system. As per recommendation 5.1, Nth the PV and OV Systems may be modified from ecor fizer-type systems to minimum outside air-type systems by permanently blanking off the PV relief dampers and permanently closing the OV bubble-tight relief dampers. A Recommendation U If the-PV relief dampers are blanked off or tne 0V relief damper l permanently closed per Recommendation 5.1, remove, disconnect, or modify the controls that modulate the PV and OV air-handling unit makeup air and return air dampers based on outside air temperature, space wmperature, and space pressure. Instead, the makeup air and return air dampers would be two position dampers. Wilen their respec-tive air-handling unit fan is operating, the dampers would be posi- ' tioned as determined during testing, adjusting, and balancing of the
,ystem to bring in the required cfm of makeup air in the accident mode. When the respective air-handling unit fan is not operating..the dampers would assume their failed positions. Smoke purging of the Control Room would require opening the doors to the Turbine Building )
and using portable smoke removal equipment to purge the smoke from the main control room. ! O N,] _ _ _ _ _ _ _ _ __-. I
SARGENT S LUNDY r for Coments k Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 5.7 Pressure Control and Indication B'Jth the PV and OV systems currently have an instrumentation loop ] which controls and indicates pressure in the Control Room and Computer l Room with respect to the Turbine Building and the Auxiliary Build-ing. For a detailed discussion regarding these instrumentation loops, 5ee the Control Room HVAC Design Review previously prepared by S&L and associated meeting notes, References 6.10, 6.2, and 6.3. Recommendations As detailed in the Design Review, Reference 6.10, modify the PV system to indicate Control Room pressure relative to the Turbine Building only. A new sensing line should be run into the' Turbine Building to assure that it is Turbine Building pressure that is being sensed. The IO OV system should be modified to indicate TSC, not Computer Room, pres-sure relative to the Turbine Building only. Again a new sensing line should be run into the Turbine Building. Test, adjust, and balance the PV and OV Systems such that all areas required to be habitable in abnormal operation are at least +1/8 in. H 2 O relative to potentially uninhabitable areas. If the PV and OV economizer systems are left intact, proper operation of the economizer features should be verified. 5.8 Door Between the Control Room and TSC With the door between the Control Room and the TSC closed, the PV system can pressurize the Control Room. The air pressure gauge in the Control Room reads +1/8" to +1/4" H2 0. Preliminary measurements taken with hand-held instruments verified that the Control Room was +1/8" to
+1/4" Hp 0 with respect to adjacent areas across doors. However, with the door between the Control Room and the TSC open, the pressure differential from the Control Room to adjacent spaces across doors was not detectable with the hand-held instruments. At times, the gauge in
SARGENT 5 LUNDY for Comments O'd Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 the Control Room was indicating a negative pressure. When the door I between the Control Room and the TSC was held slightly open, a signif-icant quantity of air was moving out of the Control Room into the TSC. Recommendation Take field measurements and evaluate the OV System to assess system functional performance and assist in further recommendations regarding whether the door between the Control Room and the TSC can be left open or should be closed at all times. 5.9 OV/TSC System Operation / Pressure The OV System was not pressurizing the TSC. When the door between the Control Room and the TSC was open, the difference was being made up by Q air from the Control Room as described in Section 5.8. In this condition, the TSC pressure was approximately equal to the pressure in the vestibule to the Turbine Building. When the door between the Control Room and the TSC was closec, air appeared to be entering the TSC from the Control Room and the Turbine Building. A breeze into the TSC couli be felt around the door between the Control Room and the TSC and under the pass through window between the TSC and the vestibule to the Turbine Building. Thus, in this j condition, the pressure in the TSC was negative with respect to the ! i vestibule to the Turbine Building. 1 Note that in addition to the TSC, the OV System is intended to {
- pressurize tne Auxiliary Electrical Equipment Rooms (AEER), the Com- I puter Rooms, the kitchen, and the toilet. Any system unbalance or ;
loss of pressurization air in any of these areas is a concern. For j example, it appears as if more than 100 cfm is being supplied to each
. Computer Room and the Computer Room returns are normally isolated from ,
t
SARGENT& LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 the OV System. In addition to loss of pressurization air around doors, windows, and penetrations, OV System air could be leaking from the AEERs into Ma Battery Room's exhaust, lost into the Auxiliary Building exhaust system through the stairways, leaking out the pres-sure boundary through block walls (such as the PV and OV duct chases), and leaking out positively pressurized sections of the 0V System duct. It may be desirable to add a larger quantity of pressurization air to the 0V System, provided the dose requirements of 10 CFR 50, Appendix A, General Design Criteria 19, and 10 CFR 100 are not exceeded. It may be desirable to make the OV pressurized boundary smaller by drop-ping out areas. , Note that maintaining the OV boundary at the same pressure as the Control Room requires that PV System concerns such as redundancy and unfiltered inleakage be addressed for the 0V System also. Recommendation l Take field measurements and evaluate the OV System to assist in identifying and resolving unbalances in the systems and areas of loss of pressurization air. Modify, test and balance the OV System per the results of the system evaluation. 5.10 Drain Lines The Air-Handling Unit drains and Makeup Air Filter Unit drains for both the PV and OV Systems should be provided with a means to prevent leakage of air, either in or out. Drains without some means of preventing airflow are a concern because in pressurized plenums, the drains are a loss of pressurization air and in plenums under a negative pressure, drains are a potential !
1 SARGENT& LUNDY j Q V Commonwealth Edison Company For Coments April 29, 1987 Zion Station - Units I and 2 Project 7805-00 source of unfiltered inleakage. Non-operating unit drains may be pulled negative by the operating air-handling unit due to damper leakage. Leakage may be prevented by one of three devices. The first is a water loop seal. .The PV and OV System Air-Handling Unit drains have water loop seals. If water loop seals are used, a maintenance proce-dure must be established to ensure the traps are filled at all l- times. Also, the size of the water loop seals should be checked to assure that they are not blown dry by the fan pressure head. Check valves are the second device which may be utilized to prevent air leakage. They will open to relieve water under a specific pressure. The check valves should be designed to remain closed (air-tight) unless a predetermined column of water is exerting pressure on it. The third device is a solenoid valve. lne TSC Makeup Air Filter Unit drains have solenoid valves which open or, detection of high tempera-ture in the Unit. Solenoid valves could also be designed to open upon a signal which indicates a predetermined water level above the valve. Solenoid valves snould also be designed to be airtight when closed. Recommendation Evaluate each PV ed OV System Air-Handling Unit and Makeup Air Filter Unit and determine the means to be used to prevent leakage of air through the drains for each. 5.11 Outer Cable Spreading Room Return Duct In abnormal operation, the 630 Elevation outer cable spreading room return duct is isolated from the OV System 642 Elevation return duct by damper 0FCV-0V-105. The damper isolates because in abnormal opera-tion, the 0V System 642 Elevation is designed to be habitable, while the 630/617 Elevation is potentially contaminated. However, isolation f j
)
SARGENT S LUNDY (n) Commonwealth Edison Company For Coments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 damper 0FCV-0V-105 is not a bubble-tight damper. Any leakage past isolation damper 0FCV-0V-105 would be leakage of potentially contami-nated outer cable spreading room air into the 642 Elevation OV Sys-tem. This leakage could affect habitability in the 642 Elevation areas served by the 0V System, including the TSC. Recommendation Evaluate the effects on habitability in the 642 Elevation areas served by the OV System of leakage past isolation damper 0FCV-0V-105. If the leakage past isolation damper 0FCV-0V-105 is unacceptable, replace the damper with a bubble-tight damper or redundant bubble-tight dampers (as determined by CECO per Recommendation 5.3). 5.12 General Recommendations 5.12.1 Prepare as-built drawings resolving the discrepancies detailed in Attachment D found during the walkdown. 5.12.2 Specifically identify the .oble-tight dampers on the P& ids using a unique symbol or label. 5.12.3 Inspect the PV System and OV System Air-Handling Unit and return fan isolation dampers and replace all damaged seals. This will reduce the run-around leakage which recirculates through the nonoperating train.
l SARGENT S LUNDY
/
For Comments
- \ -) . Connonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 6.0 Reference Documents The following documents were used in preparing this report:
6.1 Project Plan for Project No. 7805-00 including notes of a meeting held at Zion Station on September 17, 1986. 6.2 Notes of meeting held at Zion Station on April 11, 1986, to discuss the Control Room HVAC Design Review, transmitted to CECO under cover of a letter dated April 18, 1986. 1 6.3 Notes of Meeting held at CECO-SNED on May 7, 1986, to discuss OV HVAC System Boundary Leakage, transmitted to CECO under cover of a letter dated May 13, 1986. N- -) 6.4 NRC Documents 6.4.1 Notice of Trojan Plant Violation and Proposed Imposition of Civil Penalty, EA 86-54 i 6.4.2 IE Information Notice No. 86-76 6.4.3 USNRC Regulatory Requirement 10 CFR 50 Appendix A, General Design Criteria 19 i 6.4.4 NUREG-0737, Clarification of TMI Action Plan Requirements 6.4.5 NUREG-0800, Standard Review Plan 6.4, Control Room ' Habitability System, Rev. 2, July 1981 6.4.6 Regulatory Guide 1.140, Design, Testing and Maintenance Criteria for Normal Ventilation Exhaust System Air C I
i l SARGENT E LUNDY O for Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Filtration and Adsorption Units of Light-Water-Cooled Nuclear Power Plants, Revision 1, Octcber 1979 l 6.4.7 USNRC Regulatory Requirement 10 CFR 100 6.5 ANSI N510 - 1980, Testing of Nuclear Air-Cleaning Systems 6.6 Cocket No. 05000295 Licensee Event Report (LER) No. 86-035-00 6.7 Zion Station Functional Descriptions 6.7.1 Control Room HVAC System FD-PV-01, Revision C 6.7.2 Computer Rooms, Auxiliary Electrical Equipment Rooms, and Miscellaneous Rooms HVAC System FD-0V-01, Revision C 6.7.3 Additional HVAC components serving the Technical Support Center FD-0V-02, Revision D 6.7.4 Counting Room HVAC System FD-0V-03, Revision B 6.8 Zion Technical Specifications Sections 6.8.1 3.17 - Limiting Condition for Operation - Ventilation - pages 281-283 6.8.2 4.17 - Surveillance Requirements - Ventilation - pages 281-286 6.8.3 Table 4.17 HEPA/ Charcoal Filter Systems Surveillance Requirements - page 284 1
SARGENT& LUNDY For Coments A Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 ' 6.8.4 Table 4.17 Particulate Surveillance Requirements - page 286 6.9 Zion FSAR Sections: 6.9.1 9.10.3 - Control Room Heating Ventilating and Air Con-ditioning Systems, System Design and Operation ; l 9.10.4 - Normal Operation 9.10.5 - Control Room Ventilation Isolation 6.10 Control Room HVAC Design Review dated April 8, 1986, transmitted to I CECO under cover of a letter dated April 8, 1986 6.11 PV Instrument Index 6.12 OV Instrument Index 1 6.13 Zion Drawings: (See Attachment D) ; Drawing Number Revision M77, Sheet 2 AE M77, Sheet . H M77, Sheet 3 M I M81 V 4 M315 K l M316 S l M317, Sheet 1 AC M318 AC n M382, Sheet 1 AH U l l 1 - - _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ . __ _ 1
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l i SARGENT 5 LUNDY For Comments [AM Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 l 6.14 Zion HVAC Data Sheets: Data Sheet Number Revision OMD 35 3-7-86 OMD 37 10-25-77 OMD 38 8-23-72 OMD 01 9-1-77 OMD 03 8-23-72 OMD 04 8-23-72 6.15 Zion Test Procedures 6.15.1 TSSP-28-86, Pre-Operational Te. t of TSC Make-Up Filter (3 Deluge System V 6.15.2 TSSP-30-86, Pre-Operational Test of TSC HVAC Components 6.16 Summary of Recommendations Resulting From OV System Flow measurements, dated March 9, 1987. Attachment D to the Notes of Meeting Held in Sargent & Lundy's Offices on March 10, 1987, transmitted to CECO under cover of a letter dated March 25, 1987. 1 6.17 Sargent & Lundy Calculations: I 6.17.1 Relief Damper Leakage Calculation DPLK-1, Revision 0, l approved 10/18/86, Project No. 7805-00. 6.17.2 Control Room Dose Calculation Input, Calculation No. PV-10, Revision 0, approved 3/27/87, Project No. 7897-00. 4 1 j i l
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l-ATTACHMENT A 3ROJ. NO. 7805-0 3 2 AGE 2 0F 2 { jry on AccA Myvin- r ?HE AG E /L$., staap ef %E s. A .D c> , Ac sistrus
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AU XILI ART Bull 0t NG CABLg UNIT 1 UNif 2 CABLE CONTAIN M E N T CONTAIM MENT PENET RATION PE NE7 R ATION PURGE ROOM PURGE ROOM VAULT VMAT5l a a ( a o INNER CABLE INNER CABLE OUTER CASLE OUTER CABLE S P R E ADING ROOM > S P R E ADI N 6 ROOM EPRE ADING ROOM
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E LEVAf TON 6 t ?bo* L k - CONTROL ROOM 15 THE ONLY ARE A SERVED SY THE PV $YSTEM. SOUNDRY OF THE ARE A5 SERVED SY THE OV SYSTEM AND THE 45 Ml0NLtGNTED gog ggggg ggy y gggggg gg e STA4RWAYS NAVE DOORS TO THE AuXittARY SUIL0tNO 2108s STAf eces UNITS 1 & 2 slNE Bul60lNO ON E L E V ATION $ 9 2*-O* PROJECT A 18 06 ~O0
SARGENT & LUNDY I ) For Coments V Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Attachment 8 1 REVIEW 0F ZION WITH RESPECT TO RECENT TROJAN IE BULLETINS RESTATEMENT OF ISSUES OUTLINED IN IE AND EA NOTICES HOW ZION COMPARES
- 1. IE-86-76: 1. Response:
During a test of the control room Surveillance tests measuring airflow emergency ventilation system the out- quantity provide assurance that makeup side air supply damper closed when it pressurization air is being added to should have maintained a minimum posi-the PV System during abnormal opera- i tion of 150 cfm. This left the system tion. Section 4.17.1-C of the Zion running with no makeup (pressuriza- Technical Specification requires that tion) air. the control room makeup air be main-tained at 2000 cfm +10%. CECO to verify acceptability of surveillance tests.
- 2. IE-86-76: 2. Response:
During the test mentioned in 1 above, Exhaust fans at the Zion plant con-the toilet exhaust fans continued to tinue to operate during the emergency operate when they should have shutoff, mode. However, the Zion control room resulting in exhaust air from the positive pressure boundary is isolated system / boundary without makeup air, from i;hese fans in the emergency operating mode.
- 3. IE-86-76: 3. Response Due to the combination of Items 1 and The surveillance test and exnaust fan f 2 above, a slightly negative pressure arrangement discussed in Responses 1 {
o: curred in the control room. By de- and 2 illustrate that pressurization j sign the control room should be main- air can be maintained in the Zion 1 tained at 1/8-in. positive pressure. control room. Furthermore, Section ' Attachment 1 to IE 86-76 stated that 9.10.5 of the Zion FSAR requires all unsealed penetrations in walls, floors doors to be tight fitting, with and ceilings allowed pressurization gaskets, and all penetra""ns to be air to escape. This added to the sealed. Plant personnel & e verified problem of maintaining a positive that the positive pressure ^ boundary is pressure. sealed to the extent practical. As a result, a positive pressure can be l maintained during the emergency l operating mode. lO 1 of 5 1 l J
SARGENT S LUNDY D) ( Commonwealth Edison Company For Comments April 29, 1987 1 Zicn Station - Units 1 and 2 Project 7805-00 RESTATEMENT OF ISSUES OUTLINED IN IE AllD EA NOTICES (Cont'd) HOW ZION COMPARES (Cont'd)
- 4. IE-86-76 & EA 86-54: 4. Response Once the outside air dampers, men- The surveillance test, mentioned in tioned in 1 above, were opened they Response 1, will verify the amount of delivered 460 cfm instead of the 150 outside air delivered to the system.
cfm called for by design. This added The technical specification require-to the danger of exceeding the allow- ment of 2000 cfm +10% must not be able limits for radiation exposure in exceeded. the control room.
- 5. IE-86-76 & EA 86-54: 5. Response:
Unfiltered, potentially contaminated An inspection of the ductwork and air-air, was allowed to enter the control handling equipment will assure that room ventilation system through unit there are no openings allowing unfil-drains, openings in equipment housing tered air to enter the system. There and openings in the ductwork. Also, are two areas where drains are a drains for redundant units were tied O together. Redundant units are to be totally separated including the potential problem in the Zion control room ventilation system. One is in the emergency filter unit (0PV005) and drains. If the common drain becomes the other is in the control room sup-contaminated, so will both units. ply air handlers (OPV009-0A and Some drains did contain water loop OPV010-08). seals but some of these seals were found dry. The emergency filter unit contains two drains as part of the fire protection system. One drain is located between the two charcoal filter banks and is capped. The other is located between j the HEPA filter banks and the charcoal a filter banks and is hard piped into ' the auxiliary building drain system. Any air-that enters through the open drain will be filtered for iodine but not particulate. As a result, there is the potential for contamination. l Ah:0, air entering the filter unit j through the open drain has not been ' i evaluated and may have an effect on the calculated Control Room dose. , l i l 2 of 5
l SARGENT & LUNDY h) v Commonwealth Edison Company For Coments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 RESTATEMENT OF ISSUES OUTLINED IN IE AND EA NOTICES (Cont'd) HOW ZION COMPARES (Cont'd) j Each control room supply air handler contains a condensate drain that is trapped for isolation. However, there are no provisions to assure that these traps remain full. As a result it must be assumed that these drains are , open to the cuxiliary building. The drain in the operating air handler is subjected to a positive pressure by the supply fan allowing pressurization air to escape. The drain in the standby air handler can potentially be subjected to a negative pressure by back-flow to the suction side of the operating air handler. This creates the potential for unfiltered inleak-age. There are isolation dampers that n close when the standby unit is off, but they will leak because they are ij not bubble-tight. The traps that are installed should also be checked to assure that they are not blown dry by the fan pressure head and administrative procedures should be established to periodically check water level.
- 6. IE-86-76: 6. Response:
During testing of the control room This item is not applicable to the emergency ventilation system the humi- Zion plant because there are no distat was set at 100% R.H. This kept heaters in the emergency makeup air 4 the humidifier heater off when the filtering system. CECO to verify that Technical Specifications required it the emergency makeup air filtering to be on during testing. system is tested in accordance with Section 4.17 of the Zion Technical Specification. O V 3 of 5
SARGENT S LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 RESTATEMENT OF ISSUES OUTLIhED IN IE AND EA NOTICES (Cont'd) HOW ZION COMPARES (Cont'd)
- 7. IE-86-76_(attachment): 7. Response:
The control room temperature was The temperature in the Zion control measured in the center of the room room is also measured in the space, where it should have been measured at However, return air is taken directly the instrument panel. Control room from inside the control cabinet and conditioning is for the equipment, not plant personnel have verified that the the personnel. return air temperature is only about 5 F above the room temperature. Return air temperature was measured using a duct-mounted temperature indi-cator. CECO personnel should also verify that cabinet temperatures are within manufacturers' specifications.
- 8. IE 86-76 (attachment): 8. Response The control room differential pressure Per Section 9.10.4 of the Zion FSAR, p(/ was measured between the control room the control room pressure must be and the outdoors. It should be maintained at +.25 in. H p0 .03 in.
measured between the control room and Hp0 with respect to adjacent spaces. the adjacent space that has the poten- The present control system measures tial for the highest positive pres- the pressure differential between the sure. control room and turbine building and between the control room and auxiliary building. The control system averages these two differential pressures and maintains the control room pressure at
+.25 in. H 2O with respect to the average. A previous Sargent & Lundy design review (see Reference 6.10) evaluated the acceptability of modify-ing the control scheme to keep the control room at +.125 in. H 2O with respect to the turbine building only. The review concluded that the change was acceptLble.
- 9. IE-86-76 (attachment): 9. Response:
! The charcoal filters were laboratory All filters must be tested to the l tested at temperatures much higher conditions outlined in Section than expected during an accident.
- 4.17.1-c of t9 plant Technical This resulted in erroneously high Specificat4ns. CECO to verify that efficiency values. Technical Specification requirements are adhered to.
4 of 5 1
l 1 l SARGENT 5 LUNDY ) ID for Comments V Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 RESTATEMENT 0F ISSUES OUTLINED IN IE AND EA NOTICES (Cont'd) HOW ZION COMPARES (Cont'd)
- 10. IE-86-76 (attachment): 10. Response There appeared to be no individual Appropriate plant personnel must )
designated as responsible for the assure that the as-built configura- 1 ventilation systems. There also tion, operation, maintenance, and j appeared to be a lack of understanding testing of all HVAC systems are in 1 of the systems and their operation. accordance with the plant Technical l Most systems reviewed do not accu- Specifications, FSAR and System rately reflect the system descriptions Descriptions. As in Response 9, submitted per Item III D3.4 of TMI above, CECO to verify that these ! action plan (NUREG-0737). documents are adhered to. L) ; 5 of 5
Commonwealth Edison Company ATTACHMENT C April. 29,1987 Zion Station - Units 1 and 2 Project No. 7805-00 IS0 METRIC SKETCH OF PV RELIEF DAMPER CONFIGURATIONS l
^ta OeCv-ev-Osd -
n ' "" S""" HANDLERS O'I . CONFIGURATI0i1 SHOWN ON P&ID NO. M81, Rev. V4 OPOV-PV-20A %
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Aux. Bldg. s% % Grade Floor Return Fan OPV0ll-0A gRelief to Aux. Bldg. l Exhaust System I Return Fan OW012-0B RETURNDUCTFR0; CONTROL ROOM II. CONFIGURATION SHOWN OFCV-PV-05A TO PV SUPPLY AIR ON PHYSICAL DRAWING NO. M318, Rev. AC M HANDLERS o 60 x 24 OPOV-PV-20 /
-06A 9
RELIEF 70 N eturn Fan AUX.BLD OPV0ll-0A heturn Fan RETURN DUCT FROM OPV012-08 CONTROL ROOM TO PV SUPPLY AIR III. AS-BUILT
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_ _ _ _ - _ _ _ - _ _ _ _ _ _ _ _ = _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ __ _ _ SARGENT & LUNDY For Comments I}- Commonwealth Edison Company April 29, 1987 l Zion Station - Units 1 and 2 Project 7805-00 ATTACHMENT D l Marked Up Drawings Showing Results ! of Configuration Walkdown ! Drawing No. Revision M77, Sheet 1 AE M77, Sheet 2 H l M77, Sheet 3 M l l M81 V4 M315 K M316 S M317, Sheet 1 AC , t M318 AC M382, Sheet 1 AH O 1 l
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SANGENTE LUNDY
- p. For Coments Ty. Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 EVALUATION OF THE CONTROL ROOM HVAC SYSTEM-PV i
THE COMPUTER ROOM, AUXILIARY ELECTRIC EQUIPMENT l ROOM AND MISCELLANEOUS ROOMS HVAC SYSTEM-0V LO I l
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SARGENT5 LUNDY 3 (v Commonwealth Edison Company For Consnents April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Table of Contents 1.0 Purpose 2.0 Summary of Conclusions ! 3.0 Design Intent of the PV and OV HVAC Systems and Mode of Operation at the Time of the Incident 4.0 Results of: 4.1 Configuration ard Instrumentation Walkdown 4.2 Relief Damper Leakage Calculation and Field Measurements 4.3 Technical Support Center Modification Test Procedures Review 4.4 Review of Zion with Respect to Recent Trojan IE Notices 1 5.0 Evaluation of PV and OV kVAC Systems and Recommendations for Modification 6.0 Reference Documents , 7,0 Cost Estimates to implement the Recommendations for Modification l 3 Attachments A- A Simplified Composite P&ID of the PV & OV HVAC Systems and a General Arrangement of the Areas Served by the PV and OV HVAC Systems B- Detailed Review of Zion with Respect to Recent Trojan IE and EA Notices C- Isometric Sketch of PV Relief Damper Configurations D- Marked Up Drawings Showing Results of Configuration Walkdown i l l O r
, SARGENT E LUNDY f for Coments \
Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 1.0 PURPOSE The purpose of thL report is to present the results of Sargent & P Lundy's (S&L) configuration and instrumentation walkdown and.evalua-tion of Zion Station's PV (Control Room) and OV (Computer Rooms. Auxiliary Electrical Equipment Room, Miscellaneous Rooms) HVAC Systems. The walkdown and evaluation were requested by CECO-SNED at the September 17, 1986, meeting at Zion Station (Reference 6.1). The walkdown and evaluation were requested because of an incident that released contaminated gas into the Auxiliary Building. Station personnel hypothesized that the contaminated gas was drawn into the PV and OV HVAC Systems and distributed to the Control Room and the Technical Support Center (TSC). See Docket No. 05000295 Zion Licensee Event Report (LER) No. 86-035-00 for further details (Reference 6.6). O This report presents the following: Results of the configuration and instrumentation walkdown of the PV and OV HVAC System. This verified the relative location of components and duct branches in the PV and OV Systems. The walkdown also included a limited walkdown of PV and OV System pressure control and indication instrumentation. Results of a calculation and of field measurements of the amount of unfiltered auxiliary building air induced into the PV and OV Systems through the relief dampers.
-- Results of a review of the TSC Modification Pre-Operational Test Procedures and recommendations for further tests to verify that the TSC Modification as N talled is capable of meeting its design intent.
^
- Results of a review of the Zion Systems with respect to recent issues at Trojan and identification of conditions at Zion similar to the conditions reported at Trojan.
Evaluation of and recommendations for modifications to the PV and OV Systems with respect to isolating and pressurizing the Control Room and the 642 Elevation of the OV System.
-1
SARGENTS LUNDY r \ for Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 2.0
SUMMARY
OF CONCLUSIONS The PV and OV Systems were evaluated with respect to three criteria: ,
- 1) During abnormal operation, makeup air to the systems is required to be supplied through the makeup air filter units exclusively.
- 2) During abnormal operation, the PV and OV Systems are to be isolated from each other and from the normal outside air inlet path.
- 3) The systems are to pressurize their respective service areas (i.e., the Control Room and the 642 Elevation of the 0VSystem).
I 2.1 Criteria 1, Unfiltered Inleakage Section 4.1.8 discusses the leakage of unfiltered air into the PV Sys-tem. Section 5.1 discusses the leakage of unfiltered air into the 0V System. It is recommended that the PV relief dampers be permanently blanked off or replaced with bubble-tight dampers. If the PV relief j dampers are blanked off or the OV bubble-tight relief damper perma-nently closed (as discussed in Section 5.1), the economizer controls should be deleted as discussed in Section 5.6. Section 5.1 also rec-ommends the implementation of means to assure only one 0V train oper-ates in the abnormal mode. It is also recommended that field measure-ments be taken, the 0V System be evaluated, and the system be balanced
)
as required. Section 5.10 discusses the possibility of unfiltered
]
leakage into filter units and air-handling units through drains. It
]
is recommended that all the relevant drains be evaluated. Section 5.11 discusses the possibility of unfiltered inleakage through the Outer Cable Spreading Room return duct isolation damper 0FCV-0V-105. Further evaluation is recommended, l l l
SARGENT S LUNDY For Comments v Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 2.2 Criteria 2. Isolation Section 5.2 discusses isolation of both systems from the normal out-side air inlet path. Section 5.3 discusses redundancy and leaktight-ness in the OV System pressurized boundary isolation dampers. Section 5.4 discusses leakage past isolation dampers which compromises the isolation of the systems from each other. In Sections 5.2, 5.3, and 5.4, further review is recommended to assess the need for additional and/or replacement dampers. Section 5.5 recommends that the OV Lab Hoods Supply Fan be stopped when the out-side air path is isolated, or that a separate outside air path be provided for the fan. 2.3 Criteria 3, Pressurization O Both systems currently control and indicate pressure in the areas i served with respect to the Turbine Building and the Auxiliary Build- ! ing. Section 5.7 recommends that Control Room and TSC pressures be indicated with respect to the Turbine Building via new sensing lines ' into the Turbine Building. It is also recommended that PV and OV Systems be balanced to maintain the proper pressures. Section 5.8 discusses the effect on Control Room pressure of the door between the Control Room and the TSC. It is recommended that field measurements and evcluation of the 0V System include an assessment of the conse-quences of door position on room pressure. Section S.9 discusses the lack of pressurization in the 642 Elevation OV System boundary. Field measurements, evaluation and balancing of the 0V System are recom-mended. O
SARGENT5 LUNDY ( For Comments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 3.0 DESIGN INTENT OF THE PV AND OV HVAC SYSTEMS AND MODE OF OPERATION AT THE TIME OF THE INCIDENT Attachment A includes a simplified composite flow diagram of the PV and OV Systems. Also included is a sketch showing the general arrangement of the areas served by these systems. The following is a ; brief description of each system. 3,1 C_ontrol Room (PV) HVAC System For a detailed description of the PV System, see Functional Descrip-tion FD-PV-01, Reference 6.7.1. In all modes of operation, air is ; supplied to the control room by one of two 100% Air-Handling Units OPV009-0A or OPV010-08. Air is returned from the control room by one of two 100% Return Fans (0PV011-0A or OPV012-08). 3.1.1 Normal Operation A minimum quantity of makeup air is continuously supplied to maintain a positive pressure in the control room. During normal operation, makeup air is taken from the outdoors. When outdoor conditions l permit, up to 100% outdoor air may be supplied to the control room to satisfy cooling requirements. When the quantity of outside air supplied to the PV system is in excess of the minimum makeup air required, the excess air is released to the Auxiliary Building through one of two 100% relief dampers OPDV-PV-20A or OPDV-PV-20B located {' downstream of the return fans. 3.1.2 Abnormal Operation If high radiation is detected in the outside air intake, or if safety injection is initiated, the outside air path is isolated by dampers ) 0FCV-PV-39 and 0FCV-PV-11A. Makeup air is then taken from the turbine [3 building and drawn through the control room makeup filter unit OPV005 by one of two 100% makeup filter unit fans OPV015-0A or OPV016-0B.
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t J
I
. ., SARGENT & LUNDY For Comments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 The air is then fed to the operating air-handling unit, and finally to the Control Room.
3.2 Computer Rooms, Auxiliary Electrical Rooms and Miscellaneous Rooms (OV) HVAC System for a detailed description of the 0V System, see Functional Descrip-tions FO-0V-01, FO-0V-02 and FD-0V-03, (References 6.7.2, 6.7.3 and 6.7.4). In summary, the major components of the OV System (Reference 6.7.2) consist of two 50% equipment trains. The equipment trains consist of supply Air Handling Units 00V001-0A and 00V002-0B and Return Fans 00V003-0A and 00V004-08. Normally, both trains operate serving floor Elevations 642 and 630/617. 3.2.1 Normal Operation a) A minimum quantity of makeup air is continuously supplied to maintain a positive pressure in the areas served with respect to adjacent areas of the auxiliary building and turbine building to prevent inleakage. During normal operation, makeup air is taken from the outdoors. When outdoor conditions permit, up to 100% outdoor air may be supplied to satisfy the different rooms' cooling require-ments. When the quantity of outside air supplied to the 0V System is in excess of the minimum makeup air the OV System requires, the excess air is released to the auxiliary building through relief damper OPDV-0V-14 and bubble-tight damper 0FCV-0V-102, located in series, downstream of the return fans. b) During normal operation, air from the battery rooms, kit-chen and toilet on Elevation 642 and the cold lab, and decontamination room on Elevation 617 is exhausted through one of two 100% Exhaust Fans 00V007-0A or 00V008-08 to the auxiliary building exhaust duct, and then to the stack. Air from the hot lab on Elevation 617 is exhausted through Filter Unit 00V048 by one of two 100% Fans 00V050 or 00V051 to the containment purge exhaust duct and out the stack. g c) During normal operation, Lab Hood Supply Fan 00V049 y supplies outside air to the hot and cold lab hoods.
p i SARGENT & LUNBY For Coments . Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2- Project 7805-00 > d) Counting room air conditioning unit 00V065 mixes 200 cfm of makeup air'from the turbine building with return air and supplies the counting room on Elevation 617. This main-tains a positive pressure in the counting room with respect to the adjacent corridor. The radiation offices are sup-plied by the OV System and by a 100% recirculation unit. 3.2.2 Abnormal Operation a) If high radiation is detected in the outside air intake, the outside air path is isolated by damper 0FCV-PV-11B and bubble-tight damper 0FCV-PV-39. Elevation 630/617 is isolated by dampers 0FCV-0V-103, OFCV-0V-104, 0FCV-0V-63A, l and 0FCV-0V-638. In this mode, the system operates as two l 100% equipment trains, both of which are available to serve l elevation 642, but only one of which will operate at any l given time. Makeup air is taken from the turbine building through the TSC Makeup Filter Unit Fan 00V057, Filter Unit 00V056, and on to the operating air-handling unit. b) When the TSC filter unit fan starts, exhaust from the kitchen and toilet is isolated by dampers 0FCV-0V-97 and 0FCV-0V-98. Also, the source of battery room makeup air is
- switched from the auxiliary electrical equipment rooms I
which are within the OV pressurized boundary to the M-G set rooms which are outside the 0V pressurized boundary by l closing dampers 0FCV-0V-93 and 0FCV-0V-96 and opening dampers 0FCV-0V-91 and 0FCV-0V-94. I c) When high radiation is detected in the outside air intake, the outside air path for the Lab Hood Supply Fan 00V049 is ) isolated by damper 0FCV-PV-11C. d) The radiation cffice and counting room are part of the 617 Elevation which is isolated from the 0V System during the j abnormal mode. The A/C units in the radiation office and ) counting room are independent of tne UV System and operate i I in accordance with their room thermostats. The A/C units are not required to operate in case of an accident. i 3.3 Mode of PV and OV Operation at the Time of the Incident At the time of the incident the PV System was in the abnormal opera-(N ting mode (Section 3.1.2). The outside air path, which is common to the PV and OV Systems, was isolated and the Control Room Makeup Air i l
lARGElNT E LtHEDT
./ ,
,. For Comments
, Connonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Filter Unit Fan was operating. Abnormal operation was not induced by a high radiation signal, but rather by manual adjustments. These (
manual adjustments were made pending completion of a system modification. Because no high radiation signal existed, the OV System continued to operate in its normal mode with the exception of the outside air path being isolated. The TSC Makeup Air Filter Unit Fan was not operating and, therefore, the 0V System was left without a source of makeup air. As per normal operation, (Section 3.2.1), the 0V System was operating as two 50% equipment trains, one train serving the 642 Elevation and the other serving the 630/617 Elevation. Air from the battery rooms, kitchen, and toilet on Elevation 642 was being ; exhausted out the stack. Air from the Hot Lab on Elevation 617 was
\ being exhausted through Filter Unit 00V048 out the stack. The lab hood supply fan, 00V049, was attempting to supply outside air to the hot and cold lab hoods even though the outside air path was iso-lated. This situation caused negative pressure in portions of the 0V duct work which should have been at positive pressure.
i I 1 i
SARGENT 5 LUNDY ( For Coments U Commonwealth Edison Company April 29, 1987 ' Zion Station - Units 1 and 2 Project 7805-00 4.0 RESULTS OF: The following Sections, 4.1 through 4.4, present the results of the Configuration and Instrumentation Walkdown, Relief Damper Leakage Calculation and Field Measurements, TSC Modification Test Procedure Review, and Review of Zion with Respect to Recent Trojan IE Notices. Recommendations regarding these issues are presented in Section 5. 4.1 Configuration and Instrumentation Walkdown A configuration walkdown of the Zion PV and OV HVAC Systems was performed the week of September 22, 1986. The results were compared against the P& ids and physical drawings (Reference 6.13), to verify i the relative location of HVAC components with respect to other components and duct branches. The term " components" includes isola- i tion dampers, modulation dampers, manual balancing dampers, fans, filters, coils, mixing boxes, and humidifiers. The as-found position of manual balancing damper blades was also noted as " percent open." The walkdown included the instrumentation which senses, controls, and indicates Control Room and Computer Room pressure relative to the Auxiliary Building and the Turbine Building. The results of the walkdown have been noted on the drawings and in-cluded as Attachment D. The results are evaluated in terms of the design requirements of isolating and providing filtered pressurization air for control room and the 642 Elevation of the OV System. 4.1.1 Mixing Boxes 00V045 and 00V034 a) P&ID No. M77, Sheet 1, Revision AE: Mixing Boxes 00V045 and 00V034 serving the HVAC Equipment Room and the Outer Cable Spreading Room are shown tapping into the main OV supply ducts upstream of isolation dampers k 0FCV-0V-103 and 0FCV-0V-104.
1 SARGENT & LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 l b) Physical Drawing No. M318, Revision AC: l Mixing Boxes 00V045 and 00V034 are shown tapping into the main OV supply ducts downstream of isolation dampers 0FCV-OV-103 and 0FCV-0V-104. c) Walkdown Results: Physical Drawing No. M318 Revision AC, shows the as-built configuration. d) Comments: The as-built configuration is consistent with the design intent of isolating the 630/617 Elevation of the OV System in abnormal operation. i' 4.1.2 Inner and Outer Cable Spreading Room Return Duct O V a) P&ID Drawing No. M77, Sheet 1 Revision AE: The inner cable spreading room return duct is shown tieing into the outer cable spreading room return duct which ties . into the 0V Syste,642 Elevation return duct. l b) Physical Drawing Nos. M315 Revision K, M316, Revision S. and M317, Sheet 1, Revision AC: The inner cable spreading room return duct is shown tieing into the OV System 617 Elevation return duct. The outer cable spreading room return duct is shown tieing into the OV System 642 Elevation return duct. c) Walkdown Results: ! Physical Drawing Nos. M315. Revision K, M316, Revision S, and M317, Sheet 1, Revision AC, show the as-built l configuration. d) Comments: The as-built confiorration of the inner cable spreading room return duct is per the design intent of isolating tne m cable spreading room (610 Elevation) from the 642 Elevation ' OV System in abnormal operation. Isolation is achieved by bubble-tight isolation damper 0FCV-0V-99.
SARGENT 8 LUNDY l l ,. For Coments
\ Commonwealth Edison Company April 29, 1987 l Zion Station - Units 1 and 2 Project 7805-00 The as-built configuration of the outer cable spreading room return duct'needs further evaluation. See Section 5.11.
4.1.3 Unit 2 Battery Rooms Exhaust Duct a) P&ID No. M77, Sheet 1, Revision AE: The Unit 2 battery room's exhaust duct is shown tieing into the kitchen, toilet, and Unit 1 battery room's exhaust duct. b) Physical Drawing Nos. M316, Revision S, M317, Sheet 1 Revision AC, M318, Revision AC: The kitchen, toilet, and Unit 1 battery room's exhaust duct is shown tieing into the Cold Lab exhaust; this combination is then shown ticing into the decontamination room exhaust. The Unit 2 battery room's exhaust duct then ties
'into this combination.
c) Walkdown Results: Physical Drawing Nos. M316, Revision S, M317, Sheet 1, Revision AC, M318, Revision AC, show the as-built configuration. d) Comments: The as-built configuration is consistent with the design intent of not exhausting air from the 642 Elevation pres-surized boundary in abnormal operation. Although there is a difference between the P&ID and the as-built configura-tion, both configurations are functionally acceptable. 4.1.4 Radiation Offices HVAC Unit a) P&ID Drawing No. M77, Sheet 1, Revision AE: The drawing does not show the 4000 cfm recirculating unit which serves the radiation offices, b) Physical Drawing No. 316, Revision S: The drawing shows a 4000 cfm recirculating unit which
,( serves the radiation offices.
SARGENTS LUNDY r) b Commonwealth Edison Company for Comments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 l c) Walkdown Results: A 4000 cfm recirculating unit serves the radiation offices. d). Comments: Since the 4000 cfm unit serving the radiation offices is a recirculating unit which does not interact with the 0V and PV Systems, the as-built configuration is acceptable. 4.1.5 Shift Engineers Office and Prime Computer Room a) P&ID No. M77, Sheet 1, Revision AE: , The drawing shows the Shift Engineers Office with 800 cfm supply and exhaust separated from the Prime Computer Room by a wall. Mixing box 00V031 is shown supplying 300 cfm to the Prime Computer Room. A 300 cfm return duct is located in the Prime Computer Room. b) Physical Drawing No, M317, Sheet 1, Revision AC: Same as P&ID. c) Walkdown Results: The Shift Engineers Office and its 800 cfm supply and re-turn are now part of the Prime Computer Room. 'A portion of the Prime Computer Room is now partitioned by a wall and closed door creating a new office. This office is supplied with 300 cfm by mixing box 00V031. The return for this 300 cfm is still in the Prime Computer Room, d) Comments: The as-built configuration results in an imbalance in the ' ducted supply and return in the Prime Computer Room and the Office. 800 cfm is being supplied to the Prime Computer Room with 1100 cfm being returned. 300 cfm is being supplied to the office with no return. For the resolution of these concerns, see Reference 6.16, Recommendations j, k, and 1.
I, i g SARGENT & LUNDY For Comnents Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and P . Project 7805-00 4.1.6 File and Hot Instrument Rooms 1 l a) P&I'J No. M77, Sheet 1, Revision AE: l The Radiation Room, File Room, and Hot Instrument Room are shown as separate rooms. b) Physical Dr ning M316. Revision S: , j Same as P&ID. c) Walkdown Results: I The File Room and Hot Instrument Room are now part of the Radiation Room, d) Comments: Regardless of the arrangement, these areas of the plant are isolated from the 642 Elevation OV System in abnormal operation as is the design intent. 4.1.7 Counting Room A/C Unit a) P&ID No, M77, Sheet 2, Revision H: , The new Counting Room A/C unit number is shown as 00\%52. b) Physical Drawing No. M316, Revision S: The new Counting Room A/C unit number is shown as 00V065. c) Walkdown Results: The Physical Drawing No. M316, Revision S, shows the correct new Counting Room A/C unit number. d) Comments: 1 No effect on the design intent. I 1 O l
J SARGENT& LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.1.8 PV Relief Dampers and Associated Ductwork (See Attachment C) a) P&ID, No. M81, Revision V4: Isolation dampers 0FCV-PV-06A and 0FCV-PV-05A are on the exhaust sides of the two 100% capacity redundant return fans OPV012-0B and OPV011-0A. Following these two dampers, the two separate ducts join together. A relief duct branches off and then two PV relief dampers, in series, are located in the relief duct branch. b) Physical Drawing No. M318, Revision AC: Section 0-0 shows the same configuration as the P&ID with one exception. Instead of two PV relief dampers, one 24" x 60" relief damper labeled OPOV-PV-20 is shown.. A 24" x 36" duct leading to the relief damper downstream of isolation dampers 0FCV-PV-06A and 0FCV-PV-05A is shown. A 24" x 60" plenum is shown downstream of return fans OPV012-06 and OPV011-0A. c) Walkdown Results: Return fans OPV012-0B and OPV011-0A feed directly into two separate 24" x 30" ducts. In contrast to the P&ID and physical drawing, the ducts drop down to the relief dampers and rise up to the isolation dampers. The two relief dam-pers are 24" x 30". Above the isolation dampers, the two separate 24" x 30" ducts merge to become the PV system return duct leading to the air handlers. In summary, the relief dampers are not in series with the isolation dam-pers, but rather are in parallel with them. d) Comments: The return fans are two 100% capacity redundant fans. The inlets to the two fans are connected with no isolation damper between them. Thus, when one fan is operating, the space up to the relief damper and isolation damper asso-ciated with the non-operating return fan is drawn nega-tive. Since the space below the relief damper is the auxiliary building, relief damper leakage will draw auxiliary building air through the damper, the nonoperating fan, the operating return fan, and on to the operating air-handling unit which supplies the control room. For an
,s estimate and field measurements of unfiltered Auxiliary
( Building air that is drawn into the PV system, see Section V- 4.2. For evaluation and recommendations, see Section 5.1.
SARGENT & LUNDY Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.1.9 Outside Air ___ Intake Duct a) P&ID No, M81, Revision V4: The outside air intake duct is shown to have two dampers in series, 0FCV-PV-39 and 0FCV-PV-11A. b) Physical Drawing No. M382, Sheet 1, Revision AH: l Same as P&IO. c) Walkdown Evaluation: Bubble-tight damper 0FCV-PV-39 is as shown on the above drawings. Isolation damper 0FCV-PV-11A was inaccessible (see comments for explanation). d) Comments: 1 Subsequent to S&L's walkdown, Zion Tech Staff indicated that an instrument air line penetrates the outside air O duct. The instrument air line can be seen from the Unit 2 purge room. It is believed that the instrument air line is supplying air to the operator for Isolation Damper 0FCV-PV-11A. 4.1.10 Fire Damper OTSV-0V-0085 a) P&ID No M81, Revision V4: Fire damper OTSV-0V-0085 is shown between the inlets to return fans OPV011-0A and OPV012-00, b) Physical Drawing No, M318, Revision AC: Fire damper OTSV-0V-0085 is shown upstream of both return fan inlets. c) Walkdown Results: Physical Drawing No. M318, Revision AC, shows the as-built configuration. d) Comments: f^ No effect on the design intent. i
SARGENT& LUNDY
-( For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.1.11 Return Air Duct to Air Handler OPV010-0B a) P&ID No. M81, Revision V4:
The return air duct to air-handling unit OPV010-08 is shown intersecting the abnormal operation makeup air duct. , b)- Physical Drawing No. M318, Revision AC: The return air duct to air-handling unit OPV010-08 is shown l not intersecting the abnormal operation makeup air duct. c) Walkdown Results: Physical Drawing No. M318, Revision AC shows the as-built configuration. d) Comments: Since it was not the design intent that these ducts G intersect, the as-built configuration is consistent with b the design intent. 4.1.12 Radiation Offices Return Air Register a) P&ID - NA l o) Physical Drawing No. M316 Revision S: A 12" x 12" return air register which returns air from the Radiation Offices to the ceiling plenum is shown. c) Walkdown Results: The return air register mentioned above does not exist. d) Comments: Because other return air registers are present in the Radiation Offices, the as-built condition is acceptable, l O
SARGENTE LUNDY ' t for Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.1.13 Isolation Damper 0FCV-0V-91 a) P&lD No. M77, Sheet 1, Revision AE: 1 L ! solation damper 0FCV-0V-91 is shown in the Battery Room 1A l supply duct which comes from the M.G. Set Room. b) Physical Drawing No. M317, Revision AC: The above mentioned damper is not shown on the drawing. I c) Walkdown Results: P&l0 No. '477, Sheet 1, Revision shows the as-built config-uration. d) Comments: The as-built configuration is consistent with the design intent. (See 3.2.2b) O 4.1.14 Mixing Box 00V030 Flexible Duct t a) P&l0 No. M77, Sheet 1 Revision AE: The flexible ducts leading to Mixing Box 00V030 are shown blanked off. b) Physical Drawing No. M317, Revision AC: l No Comments. c) Walkdown Results: The flexible ducts leading to Mixing Box 00V030 were re-moved. d) Comments: The as-built configuration is consistent with the design intent.
SARGENT E LUNDY For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.1.15 Dampers 0FCV-PV-24A, 0FCV-PV-248, 0FCV-PV-28A and 0FCV-PV-288 a) P&I0 No. M81, Revision V4: 1 The dampers are correctly shown as follows: OFCV-PV-24A - A/H OPV009-0A return air damper 0FCV-PV-248 - A/H OPV009-0A outside air damper 0FCV-PV-28A - A/H OPV009-0A charcoal filter bypass damper 1 0FCV-PV-288 - A/H OPV009-0A charcoal filter face damper b) Physical Drawing No. M318, Revision AE: Section B-B shows the above mentioned dampers as associated with A/H OPV010-08. c) Walkdown Results: P&ID No. M81, Revision V4, shows the as-built configura-tion. d) Comments: Although Section B-B on the physical drawing is a section of A/H OPV010-0B, the intent was to make it a typical sec-tion showing both A/H OPV009-0A and A/H OPV010-08. That is why the dampers for both units were shown in the section view. 4.1.16 Decontam'. nation Room Exhaust and Exhaust Filter Unit 00V011 a) P&ID No. M77, Sheet 1, Revision AE: Not applicable, b) Physical Drawing No. M318, Revision AE: The Decontamination Room exhaust and exhaust filter unit 00V011 are shown above A/H OPV009-0A and up against the ceiling.
l SARSENT& LUNDY f For Coments N Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 c) Walkdown Results: The as-built location of the decontamination room exhaust and exhaust filter unit 00V011 is just east of Exhaust Fans 00V007-0A and 00V008-08, and approximately four feet off the floor. d) Comments: The as-built configuration is consistent with the design intent. (This item was not in the scope of the walkdown.) 4.1.17 Mixing Boxes 00V036 and 00V039 a) P&ID No. M77, Sheet 1, Revision AE: Mixing box 00V036 is shown supplying 870 cfm to the hall-way, cpstream of mixing box 00V039. Mixing box 00V039 is shcwn supplying 800 cfm to the hallway, downstream of mix-ing box 00V036. b) Physical Drawing No. M316, Revision S: Mixing box 00V036 is shown supplying 870 cfm to the' hall-way, downstream of mixing box 00V039. Mixing box 00V039 is shown supplying 800 cfm to the hallway, up ! ceam of mixing
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box 00V036. c) Walkdown Results: Physical Drawing No. M316, Revision S, shows the as-built configuration. d) Comments: The as-built configuration is consistent with the design intent. 4.1.18 Hot Lab Exhaust Ducts a) P&ID No. M77, Sheet 1, Revision AE: I No Comments. l O O 1 l
SARGENT & LUNDY TN ()_ Commonwealth Edison Company For Coments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 b) Physical Drawing No. M316, Revision S: No Comments. c) Walkdown Results: There are two ducts not shown on the physical drawing which exhaust air out of the hot lab. d) Comments: The additional ducts tie into a hot lab exhaust duct which is shown on the physical drawing; therefore, the as-built configuration is consistent with the design intent. 4.1.19 Dampers 0FCV-PV-28A and 0FCV-PV-288 a) P&ID No. M81, Revision V4:
,Q v Dampers 0FCV-PV-28A and 0FCV-PV-288 are shown as the face and bypass dampers for Air-Handling Unit OPV009-0A.
b) Physical Drawing No. M318 Revision AE: Dampers 0FCV-PV-28A and 0FCV-PV-288 are shown in the PV system return duct to Air-Handling Unit OPV010-08. c) Walkdown Evaluation: The P&ID shows the as-built configuration. l- d) Comments: l l The as-built configuration is consistent with the design
$ntent.
l SARGENTS LUNDY r for Comments Commonwealth Edison Company' April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 4.1.20 Control Room Pressure Control Instrumentation The instrumentation which senses Control Room presstre relative to the Auxiliary Building and the Turbine Building and centrols the pressure control dampers was included in the walkdown (see drawing M81 coordi-nates C/B-6/7). Pressure controller OPDC-PV20 sends a O psi signal per design when the Control Room pressure is less than +0.25 in. H2 0. Since the controller was putting out the correct signal, and since the pressure control instrumentation may be disabled (see Section 5.6), it was not verified that each instrument was operating and was piped correctly. Pressure control relay OXY-0V20B was found in panel OLP19. The one output signal from the relay divides into two separate paths. One ( path leads to solenoid valve OSV-PV208 for relief damper OPDV-PV208. The other path leads out of panel OLP19 where it joins with many other tubes in a tube bundle and therefore could not be further traced. To pursue this issue further would require disconnecting the tubing from the instrumentation and the relief dampers, blowing air into one end of the tubing, and observing air movement out the other end. Since the relief dampers may be blanked off and the pressure control instru-mentation may be disabled (see Section 5.6), this issue was not pur-sued any further. 4.1.21 OV System Pressure Control Instrumentation The instrumentation which senses Computer Room pressure relative to , the Auxiliary Building and the Turbine Building and Controls the 0V relief damper OPDV-0V-14 was included in the walkdown. (See drawing M-77, sheet 1, coordinates A-8.) Pressure controller OPDC-0V14 was observed at 0 psi signal as required by design when the Computer Room pressure is less than + 0.25 in. H 0. p Since the controller was putting out the correct signal, and since the pressure control instru-
SARGENT & LUNDY [
' For Comments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 mentation may be disabled (see Section 5.6), it was not verified that each instrument was operating and piped correctly.
4.2 Relief Damper Leakage Calculation and Field Measurements A calculation has been prepared to estimate the amount of air drawn into the PV and OV systems from the Auxiliary Building through dampers i OPOV-PV-20 and OPOV-0V-14 respectively (Reference 6.17.1). This calculation provides a relative estiriiate only since it is based on the indicated assumptions, walkdown results, and other immediately avail-able information. For PV system reli.ef damper OPDV-PV-20, the assumption used is that the damper leakage characteristics are equivalent to the damper manu-facturer's typical data for a damper without blade or jamb seals. N Also, the pressure differential across the damper is assumed to be 1 in. H20. The results of the calculation indicate that approximately 550 scfm of unfiltered Auxiliary Building air is leaking into the PV system through damper OPDV-PV-20 (nonoperating train). OV system relief damper 0FCV-0V-14 was in a partially open position and is a larger damper than OPDV-PV-20. Assuming that the pressure differential across the damper is 1 in. H 20, that the damper B 30* to 36* open, and assuming typical data for pressure loss for partially open dampers results in between 5,700 and 9,600 scfm of unfiltered Auxiliary Building air entering the OV system. Subsequent to the relief damper leakage calculation, leakage through the PV and OV relief dampers was measured in the field with a hot wire anemometer. The results of the field measurements are included in Reference 6.17.2 and are summarized as follows: I L-_ --
l . i l l 1' SARGENT 8 LUNDY (q'j for Coments j Commonwealth Edison Company April 29, 1987 i Zion Station - Units 1 and 2 Project 7805-00 l l Leakage into the PV system through damper OPDV-PV-208 with the A train running is 154 cfm. With the B train running, leakage into the PV system through damper OPDV-PV-20A is 236 cfm. The measured values are ! less than the calculated values primarily because the PV relief damp-ers had blade seals. The calculation assumed no blade seals. Leakage through damper OPDV-PV-20A is higher than OPOV-PV-20B because damper OPDV-PV-20A is missing the seal on one of its blades. Leakage into the 0V system through damper OPDV-0V-14 was measured at ; 1679 cfm with hot wire anemometer measurements and at 1302 cfm with pitot tube traverse measurements. Note that the hot wire anemometer measurement is higher (more conservative) than the pitot tube traverse measurement. The measured values are less than calculated values pri-marily due to the actual versus the assumed pressure difference across 4 the damper. The actual pressure differential was measured at 0.21 in. H2 0, where the calculation assumes a 1.0 in. H2 O pressure differen-tial. Section 5.1 provides an evaluation and recommendations on this issue.
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4.3 Technical Support Center Modification Test Procedures Raview_ Review of test procedures indicates that the TSC portion of the 0V system controls and interlocks is tested as designed. This procedure ) should, however, include verification of the computer room isolation l dampers' operation. Also, auxiliary electrical equipment room and i battery room damper numbers are interchanged. The procedures should j be supplemented by testing and balancing of the TSC system along with makeup filter unit testing (Reg. Guide 1.140 and ANSI N510) and veri- { fication of the as-built system. Since the TSC is an integral part of l the 0V system during emergency mode, the 0V system should be tested l and balanced in conjunction with the TSC system to verify overall sys-O tem operation. Verification of area pressure (+1/8" water) with re-spect to nonhabitable areas should be included in the Test Procedures.
SARGENT& LUNDY f'- Commonwealth Edison Company for Comments April 29, 1987 Zion Station - Units 1 and 2 Project 7005-00 4.4 Review of Zion with Respect to Recent Trojan IE Notices A violation of NRC requirements was identified at the Trojan Nuclear i Power Plant during a special inspection conducted by the NRC in early l 3 1986. The violations were due to deficiencies found in the testing and operation of the control room ventilation system. The severity level and details'on the fine are described in the NRC's " Notice of Violation and Proposed Imposition of Civil Penalty" EA 86-54. l As a result of these violations, IE Information Notice (IEIN) No. 86-76 was issued. This IEIN describes, in detail, each of the problem areas found at.the Trojan Control Room HVAC System. Attachment B provides an evaluation of how the Zion Nuclear Power ont compares to the issues described in these EA and/or IE Infor-mation Notices. The issues described in the notices were reviewed against documents available such as P&ID, physical drawings, func-tional descriptions, FSAR and Technical Specifications (documents used are listed in Section 6), and walkdown observations.. Some of the responses may require further verification by Commonwealth Edison Company since some of the information and documentation are not avail-able to S&L (as noted in Attachment B). Of the 10 issues evaluated in Attachment B, only two are potential issues at Zion. The first issue is the drain line problem as discussed in issue 5 and the second issue is the pressure controller problem as discussed in issue 8. The remainder of the issues are not applicable to Zion or only require verification for compliance to the Zion FSAR or Technical Specifications. O
SARGENT E LUNDY O V For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Issue 5 As discussed, the system drains have the potential for introducing possibly contaminated air into the system. They may also allow control room pressurization air to leak out of the system. This is one of the items that resulted in a proposed fine for the Trojan Plant. See Section 5.10 for Zion recommendations. Issue 8 The method of measuring the control room pressure differential does not demonstrate that a positive pressure of 0.25 in. Hp0 will be main-tjinedbetweenthecontrolroomandalladjacentareas. This issue is discussed in detail in References 6.10 and 6.2. See Section 5.7 for recommendations for Zion. 1 i O -
SARGENT S LUNDY O b Commonwealth Edison Company For Conments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 5.0 EVALUATION OF PV AND OV HVAC SYSTEMS AND RECOMMENDATIONS FOR MODIFICATION 5.1 Relief Dampers Leakage of Auxiliary Building air into the PV System was described in Section 4.1.8. Walkdown observations indicated that the section of OV return duct above relief damper OPOV-0V-14 was at a negative pressure relative to the Auxiliary Building in the mixed mode of operation described in Section 3.3. Also, damper OPDV-0V-14 was partially open. Under these conditions, with bubble-tight damper 0FCV-0V-102 open, potentially contaminated Auxiliary Building air would be pulled into the OV System. y Leakage of Auxiliary Building air into the PV and OV Systems is unde-I sirable. In abnormal operation, this inleakage may increase the Con-trol Room and TSC radiation. dose. The design requirement in abnormal operation is that the only makeup air added to the PV and OV Systems be through the PV and TSC Makeup Air Filter Units. Leakage through the PV relief dampers may be eliminated by one of two methods. The first is to permanently blank off the relief dampers. This would eliminate the PV economizer feature. The second method is to replace the existing relief dampers with new bubble-tight dampers which close when their associated return fan is not operating. This will require a total of four new bubble-tight dampers if redundancy is desired as determined by CECO per Recommendation 5.3. The second method will leave the PV economizer system intact. Leakage of Auxiliary Building air into the OV System was due to the mixed mode of operation as described in Section 3.3. Operation of the OV System in the abnormal mode as described in Section 3.2.2 with only f SARGENT & LUNDY For Comments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 one OV train operating results in a positive pressure in the OV return duct above relief damper OPDV-0V-14. Per S&L discussions with Station personnel, there currently is no automatic feature nor a manual procedure to assure that only one OV train operates in abnormal operation. Means of assuring that only one OV train operates in abnormat operation should be implemented. Also, in series with OV relief damper 0PDV-0V-14 is one bubble-tight damper 0FCV-0V-102. If redundancy is desired as determined by CECO per Recommendation 5.3, a second bubble-tight damper should be installed. An alternative to adding a second bubble-tight damper would be to close the existing bubble-tight damper 0FCV-0V-102 and qt seal all leak paths around the damper. Note that this alternative
>v1 would eliminate the economizer feature of the OV System. If the damper is closed, future consideration should be given to its removal and blanking off the opening.
Recommendation For the PV System, either permanently blank off the PV relief dampers ' OPDV-PV-20A and OPDV-PV-20B or replace the existing relief dampers with new bubble-tight dampers. For the OV System, if redundancy is desired as determined by CECO per Recommendation 5.3, either add a new bubble-tight damper in series with 0FCV-0V-102 or permanently close the existing bubble-tight damper 0FCV-0V-102. Implement either auto-matic or manual means of assuring that only one OV train operates in abnormal operation. 5.2 Normal Outside Air Duct Isolation Dampers ! The outside air intake for the PV and OV systems has two isolation i
> dampers in series. 0FCV-PV-11A is the original isolation damper which
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SARGENT & LUNDY []- For Coments v Commonwealth Edison Company April 29, 1987-Zion Station - Units 1 and 2 Project 7805-00 is not bubble-tight, is of unknown leakage, and was inaccessible during the walkdown. OFCV-PV-39 is a bubble-tight damper installed per the conclusion of Zion's Control Room Habitability Report to reduce leakage and ensure isolation redundancy in order to meet the full extent of NRC requirements set forth in Item 111.0.3.4 of NUREG-0737. Because damper 0FCV-PV-11A is not bubble-tight, even if it is in place and it isolates, failure of damper 0FCV-PV-39 to close due to mechanical failure will allow unfiltered outside air to leak into the PV' system. This arrangement may not conform to the requirements of Standard Review Plan (SRP) 6.4, Sections II.2.a and II.2.b which are referenced in NUREG-0737, Item III.D.3.4. SRP 6.4, Section II.2a, states that dampers used to isolate the control zone from adjacent zones or the outside must be leaktight. SRP 6.4, Section II.2.b, states that single failure of an active component should not result in loss of the system's functional performance. However, Section II.2.b also references Appendix A to SRP 6.4 which details acceptance criteria for a damper repair alternative. Credit for damper repair may be given when the following criteria are met: Internal components that are difficult to repair manually without opening the ductwork have a very low probability of failure. External components must be designed and tested to ensure that the failed component can be bypassed easily and safely and that the damper can be manipulated into an acceptable position. Location of the damper must permit easy access by the Control Room personnel. i
- Control Room instrumentation should be provided for a clear indication and annunciation of damper malfunction.
t Periodic manipulation of the damper and the controls by Control 5 Room personnel should be required for training purposes.
SARGENT& LUNDY For Comments Commonwealth Edison Company - April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Compliance with the above criteria should be documented in the SAR whenever credit is taken for the repair option. Recommendation; Verify the existence, location, and operability'of the original outside air isolation damper 0FCV-PV-11A. Provide for redundant bubble-tight outside air isolation if CECO determines it to be necessary per Recommendation 5.3. 5.3 OV System Pressurized Boundary Isolation Dampers SRP 6.4, Section II.2.a. states that dampers used to isolate the control zone from adjacent zones or the outside must be leaktight. SRP 6.4, Section II.2.b, states that single failure of an active component should not result in loss of the system's functional perfor-mance. SRP 6.4 Section II.1, states that the control zone may include the Computer Rooms, the Shift Supervisor's Office, the kitchen, and the toilet. Finally, Zion's Control Room Habitability Report states that the Computer Rooms, kitchen, and toilet are maintained in a habitable state by the OV System. Zion's Computer Rooms, kitchen, and toilet are served by the 642 Elevation OV System which is isolated and pressurized in abnormal operation. Isolation is accomplished by single dampers. Only three of the 0V System pressurized boundary isolation dampers are bubble-tight, the rest are high-quality low-leakage dampers. Dampers OFCV-0V-103 and 104 isolate the 630/617 Elevation supply. Bubble-tight j dampers 0FCV-0V-99 and 105 isolate the 630/617 Elevation return. Damper 0FCV-0V-97 isolates the toilet exhaust and 0FCV-0V-98 isolates ) the kitchen exhaust. Dampers 0FCV-0V-93 and 96 isolate the Auxiliary i
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SARGENT E LUNDY bV for Contents Commonwealth Edison Company April 29, 1987
- j. Zion Station - Units 1 and 2 Project 7805-00 Electrical Equipment Rooms from the Battery Room's exhaust. Bubble-tight damper 0FCV-PV-39 isolates the outside air path. Bubble-tight damper 0FCV-0V-102 isolates the relief path to the Auxiliary Building.
Single isolation dampers were originally acceptable based on the fact that they are fail closed pneumatic dampers. Loss of air or loss of power will close the dampers. However, mechanical failure or short circuit could prevent them from failing closed. Recommendation Commonwealth Edison Company should review Zion licensing commitments to determine whether redundant dampers are required or single dampers are acceptable. This review will also determine whether bubble-tight p dampers are required, or nonbubble-tight dampers are acceptable.
'd 5.4 Isolation Between PV and OV Systems When high radiation is detected in the outside air path, the intent of the design is to isolate the PV System from the OV System and to start the makeup units to provide filtered pressurization air. An outside air duct connects the PV Air-Handling Units with the OV Air-Handling Units. This path is isolated by damper 0FCV-PV-118 which is not a bubble-tight damper. Another outside air path connects the PV Air-Handling Units to the Lab Hoods Supply Fan. This path is isolated downstream of the fan by damper 0FCV-PV-11C which is not a bubble-tight damper.
Leakage past these isolation dampers is a loss of pressurization air from one or both of the systems. Leakage past damper 0FCV-PV-11C is either leakage out of the PV pressurized boundary or leakage of potentially contaminated air from the Hot and Cold Labs into the PV System. If leakage past damper 0FCV-PV-118 is leakage cut of the OV
l i l SARGENT & LUNDY l h Commonwealth Edison. Company For Comments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 pressurized boundary into the PV pressurized boundary, any failure which causes the OV System to become contaminated will subsequently contaminate the PV System. Recommendation ; Install either single or redundant (as determined by CECO per Recommendation 5.3) bubble-tight isolation dampers between the PV and OV Air-Handling Units and between the Hot and Cold Lab supply and the PV System. An alternative for the Hot and Cold Lab supply is to separate the outside air duct for the Hot and Cold Labs from the PV outside air duct upstream of bubble-tight isolation damper 0FCV-PV-39. 5.5 Trip of Hot and Cold Lab Supply Fan in Abnormal Operation When high radiation is detected in the outside air intake, outside air to the Hot and Cold Lab Supply Fan 00V049 is isolated by closing dampers 0FCV-PV-39 and 0FCV-PV-11A. Also, the discharge of Fan 00V049 is isolated by damper 0FCV-PV-11C. When the handswitch is in the auto position, however, Fan 00V049 operates when either or both OV Air-Handling Unit operates. Since one OV Air-Handling Unit continues to operate after detection of high radiation in the outside air intake, Fan 00V049 continues to operate even though outside air and the fan discharge have been isolated. Recommendation Modify the controls for Hot and Cold Lab Supply Fan 00V049 such that the fan stops when dampers 0FCV-PV-39, 0FCV-PV-11A and ODCV-PV-11C isolate. If the alternative of providing a separate outside air duct for the Hot and Cold Labs is chosen, it will not be necessary to stop Supply Fan 00V049 when the PV and OV Systems are in abnormal operation.
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SARGENT & LUNDY U . Commonwealth Edison Company For Comments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 5.6 Deletion of PV and OV Economizer Control Currently, both the PV and OV Systems have economizer capability which means that when outdoor conditions permit, up to 100% outdoor air may l be supplied to satisfy cooling requirements. To take in 100% outside air, the outside air damper on the inlet to the air-handling units would open 100%, the return air dampers would close so that no air returns to the air-handling units and the relief dampers would open 100% to relieve all the air out of the system. As per recommendation 5.1, both the PV and OV Systems may be modified from economizer-type systems to minimum outside air-type systems by permanently blanking off the PV relief dampers and permanently closing the OV bubble-tight relief dampers. [3
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Recommendation If the PV relief dampers are blanked off or the 0V relief damper permanently closed per Recommendation 5.1, remove, disconnect, or modify the controls that modulate the PV and OV air-handling unit makeup air and return air dampers based on outside air temperature, , space temperature, and space pressure. Instead, the makeup air and return air dampers would be two position dampers. When their respec-tive air-handling unit fan is operating, the dampers would be posi-tioned as determined during testing, adjusting, and balancing of the system to bring in the required cfm of makeup air in the accident mode. When the respective air-handling unit fan is not operating, the dampers would assume their failed positions. Smoke purging of the Control Room would require opening the doors to the Turbine Building and using portable smoke removal equipment to purge the smoke from the main control room. , l 1 0 4 _ _ _ _ _ _ _ . 1
SARGENT & LUNDY For Comments Commonwealth Edison Company April 29, 1987 , Zion Station - Units 1 and 2 Project 7805-00 l 5.7 Pressure Control and Indication Both the PV and OV systems currently have an instrumentation loop which controls and indicates pressure in the Control Room and Computer Room with respect to the Turbine Building and the Auxiliary Build-ing. For a detailed discussion regarding these instrumentation loops, see the Control Room HVAC Design Review previously prepared by S&L and , associated meeting notes, References 6.10, 6.2, and 6.3. Recommendations As detailed in the Design Review, Reference 6.10, modify the PV system to indicate Control Room pressure relative to the Turbine Building only. A new sensing line should be run into the Turbine Building to assure that it is Turbine Building pressure that'is being sensed. The OV system should be modified to indicate TSC, not Computer Room, pres-([ sure relative to the Turbine Building only. Again a new sensing line l should be run into the Turbine Building. Test, adjust, and balance the PV and OV Systems such that all areas required to be habitable in I abnormal operation are at least +1/8 in. H 2 O relative to potentially uninhabitable areas. If the PV and OV economizer systems are left intact, proper operation of the economizer features should be verified. 5.8 Door Between the Control Room and TSC With the door between the Control Room and the TSC closed, the PV system can pressurize the Control Room. The air pressure gauge in the Control Room reads +1/8" to +1/4" H2 0. Preliminary measurements taken with hand-held instruments verified that the Control Room was +1/8" to l
+1/4" Hp 0 with respect to adjacent areas across doors. However, with the door between the Control Room and the TSC open, the pressure differential from the Control Room to adjacent spaces across doors was not detectable with the hand-held instruments. At times, the gauge in L
SARGENT E LUNDY b)V Commonwealth Edison Company For Coments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 i the Control Room was indicating a negative pressure. When the door between the Control Room and the TSC was held slightly open, a signif-icant quantity of air was moving out of the Control Room into the TSC. Recommendation Take field measurements and evaluate the OV System to assess system functional performance and assist in further recommendations regarding whether the door between the Control Room and the TSC can be left open or should-be closed at all times. 5.9 OV/TSC System Operation / Pressure The OV System was not pressurizing the TSC. When the door between the Control Room and the TSC was open, the difference was being made up by air from the Control Room as described in Section 5.8. In this condition, the.TSC pressure was approximately equal to the pressure in the vestibule to the Turbine Building. When the door between the Control Room and the TSC was closed, air appeared to be entering the TSC from the Control Room and the Turbine Building. A breeze into the TSC could be felt around the door between the Control Room and the TSC and under the pass through window between the TSC and the vestibule to the Turbine Building. Thus, in this condition, the pressure in the TSC was negative with respect to the { vestibule to the Turbine Building. l Note that in addition to the TSC, the 0V System is intended to l pressurize the Auxiliary Electrical Equipment Rooms (AEER), the Com-l puter Rooms, the kitchen, and the toilet. Any system unbalance or loss of pressurization air in any of these areas is a concern. For example, it appears as if more than 100 cfm is being supplied to each Computer Room and the Computer Room returns are normally isolated from 1 L_ _ __ _ - _
SARGENT& LUNDY n t,' ) For Coments i Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7E05-00 the 0V System. In addition to loss of pressurization air around doors, windows, and penetrations OV System air could be leaking irom the AEERs into the Battery Room's exhaust, lost into the Auxiliary Building exhaust system through the stairways, leaking out the pres-sure boundary through block walls (such as the PV and OV duct chases), and leaking out positively pressurized sections of the OV System duct. It may be desirable to add a larger quantity of pressurization air to the OV System, provided the dose requirements of 10 CFR 50, Appendix A, General Design Criteria 19, and 10 CFR 100 are not exceeded. It may be desirable to make the 0V pressurized boundary smaller by drop-ping out areas. Note that maintaining the OV boundary at the same pressure.as the () Control Room requires that PV System concerns such as redundancy and unfiltered inleakage be addressed for the 0V System also, i Recommendation Take field measurements and evaluate the OV System to assist in identifying and resolving unbalances in the systems and areas of loss of pressurization air. Modify, test and balance the OV System per the results of the system evaluation. ! l 5.10 Drain Lines The Air-Handling Unit drains and Makeup Air Filter Unit drains for both the PV and OV Systems should be provided with a means to prevent leakage of air, either in or out. l Drains without some means of preventing airflow are a concern because in pressurized plenums, the drains are a loss of pressurization air
/ and in plenums under a negative pressure, drains are a potential i
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5 ARGENT E LUNDY l
.O For Coments O Commonwealth Edison Company April 29, 1987 '
Zion Station - Units 1 and 2 Project 7805-00 source of unfiltered inleakage. Non-operating unit drains may be pulled negative by the operating air-handling unit due to damper l leakage. Leakage may be prevented by one of three devices. The first is a water loop seal. The PV and OV System Air-Handling Unit drains have water loop seals. If water. loop seals are used, a maintenance proce-dure must be established to ensure the traps are filled at all times. Also, the size of the water loop seals should be checked to assure that they are not blown dry by the fan pressure head. Check valves are the second device which may be utilized to prevent air leakage. They will open to relieve water under a specific pressure. The check valves should be designed to remain closed (air-tight) unless a predetermined column of water is exerting pressure on it. The third device is a solenoid valve. The TSC Makeup Air Filter Unit drains have solenoid valves which open on detection of high tempera-ture in the Unit. Solenoid valves could also be designed to open upon a signal which indicates a predetermined water level above the valve. Solenoid valves should also be designed to be airtight when closed. Recommendation Evaluate each PV and OV System Air-Handling Unit and Makeup Air Filter Unit and determine the means to be used to prevent leakage of air through the drains for each. 5.11 Outer Cable Spreading Room Return Duct 1 In abnormal operation, the 630 Elevation outer cable spreading room return duct is isolated from the 0V System 642 Elevation return duct ! by damper 0FCV-0V-105. The damper isolates because in abnormal opera-tion, the OV System 642 Elevation is designed to be habitable, while the 630/617 Elevation is potentially contaminated. However, isolation
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s \ SARGENT E LUNDY g(~\ For Comments , Commonwealth Edison Company April 29, 1987 ; Zion Station - Units 1 and 2 Project 7805-00 damper 0FCV-0V-105 is not a bubble-tight damper. Any leakage past ; isolation damper 0FCV-0V-105 would be leakage of potentially contami-nated outer cable spreading room air into the 642 Elevation OV Sys-tem. This leakage could effect habitability in the 642 Elevation areas served by the 0V System, including the TSC. ; Recommendation Evaluate the effects on habitability in the 642 Elevation areas served by the OV System of leakage past isolation damper 0FCV-0V-105. If the leakage past isolation damper 0FCV-0V-105 is unacceptable, replace the damper with a bubble-tight damper or redundant bubble-tight dampers (as determined by CECO per Recommendation 5.3). 5.12 General Recommendations (] V 5.12.1 Prepare as-built drawings resolving the discrepancies detailed in Attachment D found during the walkdown. 5.12.2 Specifically identify the bubble-tight dampers on the P& ids using a unique symbol or label. 5.12.3 Inspect the PV System and OV System Air-Handling Unit and return fan j isolation dampers and replace all damaged seals. This will reduce the run-around leakage which recirculates through the nonoperating train. l
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,D For Comments \ Commonwealth Edison Company April 29, 1987 Zion Statton - Units 1 and 2 Project 7805-00 6.0 R_eference Documents The following documents were used in preparing this report:
6.1' Project Plan for Project No. 7805-00 including notes of a meeting held at Zion Station on September 17, 1986. 6.2 Notes of meeting held at Zion Station on April 11, 1986, to discuss the Cetrol Room HVAC Design Review, transmitted to CECO under cover of a letter dated April 18, 1986. 6.3- Notes of Meeting held at CECO-SNED on May 7, 1986, to discuss OV HVAC ; System Boundary Leakage, transmitted to CECO under cover of a letter dated May 13, 1986. 6.4 NRC Documents 6.4.1 Notice of Trojan Plant Violation and Proposed Imposition l of Civil Penalty, EA 86-54 ! 6.4.2 IE Information Notice No. 86-76 6.4.3 USNRC Regulatory Requirement 10 CFR 50 Appendix A, General Design Criteria '.9 6.4.4 NUREG-0737, Clarification of TMI Action Plan Requirements 6.4.5 NUREG-0800, Standard Review Plan 6.4, Control Room Habitability System, Rev. 2, July 1981 6.4.6 Regulatory Guide 1.140, Design, Testing and Maintenance q Criteria for Normal Ventilation Exhaust System Air O
SARGENT & LUNDY /~ (v) Commonwealth Edison Company For Coments April 29, 1987 l Zion Station - Units 1 and.2 Project 7805-00 Filtration and Adsorption Units of Light-Water-Cooled Nuclear Power Plants, Revision 1, Octcber 1979 6.4.7 USNRC Regulatory Requirement 10 CFR 100 6.5 ANSI N510 - 1980, Testing of Nuclear Air-Cleaning Systems I J 6.6 Docket No. 05000295 Licensee Event Report (LER) No. 86-035-00 ; 6.7 Zion Station Functional Descriptions i 6.7.1 Control Room HVAC System FD-PV-01, Revision C r 6.7.2 Computer Rooms, Auxiliary Electrical Equipment Rooms, and Miscellaneous Rooms HVAC System FO-0V-01, Revision C 6.7.3 Additional HVAC components serving the Technical Support Center FD-0V-02, Revision D 6.7.4 Counting Room HVAC System FD-0V-03, Revision B 6.8 Zion Technical Specifications Sections 6.8.1 3.17 - Limiting Condition for Operation - Ventilation - pages 281-283 l 1 6.8.2 4.17 - Surveillance Requirements - Ventilation - pages l 281-286 6.8.3 Table 4.17 HEPA/ Charcoal Filter Systems Surveillance n Requirements - page 284 1 . 1 I
SARGENT & LUWDY- [k For Coments Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 6.8.4 Table 4.17 Particulate Surveillance Requirements - page 286 6.9 Zion FSAR Sections: 6.9.1 9.10.3 - Control Room Heating, Ventilating and Air Con-ditioning Systems, System Design and Operation 9.10.4 - Normal Operation 9.10.5 - Control Room Ventilation Isolation 6.10 Control Room HVAC Design Review dated April 8, 1986, transmitted to CECO under cover of a letter dated April 8, 1986
'd 6.11 PV Instrument Index 6.12 OV Instrument Index 6.13 Zion Drawings: (See Attachment D)
Drawing Number Revision M77, Sheet 1 AE M77, Sheet 2 H M77, Sheet 3 M l M81 V 4 M315 K M316 S M317, Sheet 1 AC M318 AC M382, Sheet 1 AH 1 1
e i SARGENT& LUNDY [) k/ Commonwealth Edison Company For Coments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 6.14 Zion HVAC Data Sheets: Data Sheet Number Revision OMD 35 3-7-86 OMD 37 10-25-77 OMD 38 8-23-72 OMD 01 9-1-77 OMD 03 8-23-72 OMD 04 8-23-72 6.15 Zion Test Procedures 6.15.1 TSSP-28-86, Pre-Operational Test of TSC Make-Up Filter ! Deluge System 6.15.2 TSSP-30-86, Pre-Operational Test of TSC HVAC Components 6.16 Summary of Recommendations Resulting From OV System Flow measurements, dated March 9, 1987. Attachment D to the Notes of Meeting Held in Sargent & Lundy's Offices on March 10, 1987, transmitted to CECO under cover of a letter dated March 25, 1987. 6.17 Sargent & Lundy Calculations: 6.17.1 Relief Damper Leakage Calculation DPLK-1, Revision 0, approved 10/18/86, Project No. 7805-00. 6.17.2 Control Room Dose Calculation Input, Calculation No. PV-10, Revision 0, approved 3/27/87, Project No. 7897-00. O 1
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W Y vm- TURSINE BUILDING H ELEVAftON 61 T'-O' i i. (' CONTROL ROOM is THE ONLY ARE A SERVED BT THE PV SYSTEM. 60VNORY OF THE ARE AS SERVED BY TNE OY EV5f EM 15 NIGHLlGHTE D ' COM MO=8WE ALIN EDISON CO 6 STAIRWAYS HAVE DOORS TO TNE AUXILIARY SulL0 LNG AND THE ZsOes STATIOei UMlTS 1& 2
- (INF BulLOING ON E L E V Af f 0N 592'-O' PROJECT 8ea 78 05-00 f 1
I t
e ( SARGENT5 LUNDY t ( For Comments ' Coisnonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 Attachment 8 REVIEW 0F ZION WITH RESPECT TO RECENT TROJAN IE BULLETINS , RESTATEMENT OF ISSUES OUTLINED IN IE AND EA NOTICES HOW ZION COMPARES
- 1. IE-86-76: 1. Response:
During a test of the control room Surveillance tests measuring airflow emergency ventilation system the out- quantity provide as'surance that makeup side air supply damper closed when it pressurization air is being added to should have maintained a minimum posi- the PV System during abnormal opera-tion of 150 cfm. This left the system tion. Section 4.17.1-C of the Zion running with no makeup (pressuriza- Technical Specification requires that tion) air, the control room makeup air be main-tained at 2000 cfm +10%. Ceco to verify acceptability of surveillance tests.
- 2. IE-86-76: 2. Response:
During the test mentioned in 1 above, Exhaust fans at the Zion plant con-the toilet exhaust fans continued to tinue to operate during the emergency operate when they should have shutoff, mode. However, the Zion control room resulting in exhaust air from the positive pressure boundary is isolated system / boundary without makeup air, from these fans in the emergency operating mode.
- 3. IE-86-76: 3. Response Due to the combination of Items 1 and The surveillance test and exhaust fan 2 above, a slightly negative pressure arrangement discussed in Responses 1 occurred in the centrol room. By de- and 2 illustrate that pressurization sign the control room should be main- air can be maintained in the Zion tained at 1/8-in. positive pressure. control room. Furthermore, Section Attachment 1 to IE 86-76 stated that 9.10.5 of the Zion FSAR requires all unsealed penetrations in walls, floors doors to be tight fitting, with and ceilings allowed pressurization gaskets, and all penetrations to be air to escape. This added to the sealed. Plant personnel have verified problem of maintaining a positive that the positive pressure boundary is pressure. sealed to the extent practical. As a result, a positive pressure can be maintained during the emergency operating mode. ,
1 of 5
l l SARGENT S LUNDY D for Comments V Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 1 RESTATEMENT OF ISSUES OUTLINED IN IE AND EA NOTICES (Cont'd) HOW ZION COMPARES (Cont'd)
- 4. IE-86-76 & EA 86-54: 4. Response Once the outside air dampers, men- The surveillance test, mentioned in '
tioned in 1 above, were opened they Response 1, will verify the amount of delivered 460 cfm instead of the 150 outside air delivered to the system. cfm called for by design. This added The technical specification require-to the danger of exceeding the allow- ment of 2000 cfm +10% must not be able limits for radiation exposure in exceeded, the control room.
- 5. IE-86-76 & EA 86-54: 5. Response: i Unfiltered, potentially contaminated An inspection of the ductwork and air-air, was allowed to enter the control handling equipment will assure that room ventilation system through unit there are no openings allowing unfil-drains, openings in equipment housing tered air to enter the system. There and openings in the ductwork. Also, are two areas where drains are a drains for redundant units were tied potential problem in the Zion control together. Redundant units are to be room ventilation system. One is in totally separated including the the emergency filter unit (0PV005) and drains. If the common drain becomes the other is in the control room sup-contaminated, so will both units. ply air handlers (0PV009-0A and Some drains did contain water loop OPV010-08).
seals but some of these seals were { found dry. The emergency filter unit contains two { drains as part of the fire protection I system. One drain is located between the two charcoal filter banks and is capped. The other is located between I the HEPA filter banks and the charcoal filter banks and is hard piped into the auxiliary building drain system. Any air that enters through the open drain will be filtered for iodine but not particulate. As a result, there is the potential for contamination. Also, air entering the filter unit through the open drain has not been evaluated and may have an effect on the calculated Control Room dose. I O V . 1 2 of 5 i m - . . - - . _ - _ _ _ _ - . - _ . _ _ . _ . _ _ _ _
8 ARGENT E LUNDY m lg Commonwealth Edison Company for Coments April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 RESTATEMENT OF ISSUES OUTLINED IN IE AND EA NOTICES (Cont'd) HOW ZION COMPARES (Cont'd) Each control room supply air handler contains a condensate drain that is trapped for isolation. However, there are no provisions to assure that these traps remain full. As a result it must be assumed that these drains are open to the auxiliary building. The drain in the operating air handler is subjected to a positive pressure by the supply fan allowing pressurization air tn escape. The drain in the-standby air handler can potentially be subjected to a negative pressure by back-flow to the suction side of the operating air handler. This creates the potential for unfiltered inleak-age. There are isolation dampers that O close when the standby unit is off, Q but they will leak because they are not bubble-tight. The traps that are installed should also be checked to assure that they are not blown dry by the fan pressure head and administrative procedures should be established to periodically check water level.
- 6. IE-86-76: 6. Response:
During testing of the control room This item is not applicable to the emergency ventilation system the humi- Zion plant because there are no distat was set at 100% R.H. This kept heaters in the emergency makeup air the humidifier heater off when the filtering system. CECO to verify that Technical Specifications required it the emergency makeup air filtering to be on during testing. system is tested in accordance with Section 4.17 of the Zion Technical Specification. O 3 of 5
i f SARGENT E LUNDY For Comments Commonwealth Edison' Company- April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 RESTATEMENT OF ISSUES OUTLINE 0 IN IE AND EA NOTICES (Cont'd) HOW ZION COMPARES (Cont'd)
- 7. IE-86-76 (attachment): 7. Response:
The control room temperature was The temperature in the Zion control measured in the center of the room room is also measured in the space, where it should have been measured at However, return air is taken directly the instrument panel. Control room from inside the control caDinet and conditioning is for the equipment, not plant personnel have verified that the the personnel. return air temperature is only about 5*F above the room temperature. Return air temperature was measured using a duct-mounted temperature indi- . cator. CECO personnel should also verify that cabinet temperatures are within manufacturers' specifications.
- 8. IE 86-76 (attachment): 8. Response
/O The control room differential pressure Per Section 9.10.4 of the Zion FSAR,
(_) was measured between the control room the control room pressure must be and the outdoors. It should be maintained at +.25 in. H p0 .03 in. measured between the control room and Hp 0 with respect to adjacent spaces. the adjacent space that has the poten- The present control system measures tial for the highest positive pres- the pressure differential between the sure. control room and turbine building and between the control room and auxiliary building. The control system averages these two differential pressures and , maintains the control room pressure at l
+.25 in. H p0 with respect to the average. A previous Sargent & Lundy design review (see Reference 6.10) evaluated the acceptability of modify-ing the control scheme to keep the control room at +.125 in. H 2O with respect to the turbine building only. The review concluded that the change was acceptable.
- 9. IE-86-76 (attachment): 9. Response:
The charcoal filters were laboratory All filters must be tested to the tested at temperatures much higher conditions outlined in Section
,m
, than expected during an accident. 4.17.1-c of the plant Technical This resulted in erroneously high Specifications. CECO to verify that t(") efficiency values. Technical Specification requirements are adhered to.
4 of 5
SARGENT& LUNDY [ For Coments
\ '
Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Project 7805-00 RESTATEMENT OF ISSUES OUTLINED IN IE AND EA NOTICES (Cont'd) HOW ZION COMPARES (Cont'd)
- 10. IE-86-76 (attachment): 10. Response There appeared to be no individual Appropriate plant personnel must designated as responsible for the assure that the as-built configura-ventilation systems. There also tion, operation, maintena' ice, and appeared to be a lack of understanding testing of all HVAC systems are in of the systems and their operation. accordance with the plant Technical Most systems reviewed do not accu- Specifications, FSAR and System rately reflect the system descriptions Descriptions. As in Response 9, submitted per Item III D3.4 of TMI above, CECO to verify that these action plan (NUREG-0737). documents are adhered to.
4 V 1 l 4 O 5 of 5 _ - _ _ - _ _ _ _ _ _ l
Commonwealth Edison Company ATTACHMENT C April _ 29,1987
, -Zion Station - Units 1 and 2 Project No. 7805-00 N ' ISOMETRIC SKETCH OF PV RELIEF DAMPER CONFIGURATIONS ,
M TO PV SUPPLY AIR f
/ OFCV-PV-05hI HANDLERS O .I CONFIGURATION SHOWN ON P&ID NO. M81, Rev. V4 i
OPOV-PV-20A %
\ %k0FCV-PV-06A 1
Relief to N Aux. Bldg. % % Grade Floor Return Fan OPVoll-0A hRelief to Aux. Bldg. Exhaust System I IReturn Fan OPV012-0B RETURN DUCT FROM CONTROL ROOM
- 11. CONFIGURATION SHOWN OFCV-PV-05A TO PV SUPPLY AIR ON PHYSICAL DRAWING NO. M318, Rev. AC N fr HANDLERS 9 0FCV-PV-06A 60 x 24 N OPDV-PV-20 /
eturn Fan RELIEF TO N AUX.BLD OPV011-0A RETURN DUCT FROM }, " CONTROL ROOM 0FCV-PV-05A TO PV SUPPLY AIR HANDLERS III. AS-BUILT CONFIGURATION
$0PDV-PV-20A h
RELIEF TO 9
$ OFCV-PV-06A AUX.BLOG. /9 Return Fan % OPDV-PV-208 4
{ k/ OPV0ll-0A i RELIEF TO AUX. BLDG. JRiturn Fan RETURN DUCT FROM- ONTROL RM. s )ON2-08 ;
SARGENT& LUNDY For Coments
- ( >) '- Commonwealth Edison Company April 29, 1987 Zion Station - Units 1 and 2 Pro. ject 7805-00 I
ATTACHMENT D Marked Up Drawings Showing Results of Configuration Walkdown Drawing No. Revision ; M77, Sheet 1 AE l-M77, Sheet 2 H i M77, Sheet 3 M t M81 V4 M315 K M316 S M317, Sheet 1 AC r ( M318 AC M382 Sheet 1 AH O Page 1 of 10
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