ML022410059
| ML022410059 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 08/16/2002 |
| From: | Bellamy R Entergy Nuclear Operations |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| NUREG-1433 | |
| Download: ML022410059 (23) | |
Text
Entergy Nuclear Generation Co.
Entergy Pilgrim Nuclear Power Station 600 Rocky Hill Road Plymouth, MA 02360 Mike Bellamy Site Vice President August 16 , 2002 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555-0001
SUBJECT:
Entergy Nuclear Operations, Inc.
Pilgrim Nuclear Power Station Docket No. 50-293 License No. DPR-35 Request for Amendment to the Technical Specifications Relocation of Certain Control Rod Block Requirements to the Updated Final Safety Analysis Report
REFERENCE:
NUREG 1433, Standard Technical Specifications for General Electric Plants, BWR/4.
LETTER NUMBER: 2.02.065
Dear Sir or Madam:
Pursuant to 10 CFR 50.90, Entergy Nuclear Operations Inc. (Entergy) hereby proposes to amend the Pilgrim Station Facility Operating License, DPR-35. This proposed license amendment would relocate certain Control Rod Block functions from Technical Specification 3/4.2.C, "Instrumentation that Initiates Rod Blocks," to the Updated Final Safety Analysis Report. This change is consistent with Standard Technical Specifications (NUREG 1433, Revision 2) and changes previously approved by the NRC for other reactor licensees. Pilgrim has reviewed the proposed amendment in accordance with 10 CFR 50.92 and concludes it does not involve a significant hazards consideration.
Entergy requests approval of the proposed amendment by March 31, 2003 to support Pilgrim's upcoming refueling outage (scheduled to commence on April 19, 2003). Once approved, the amendment will be implemented within 60 days.
A-DDI 202065
Entergy Nuclear Operations, Inc. Letter Number: 2.02.065 Pilgrim Nuclear Power Station Page 2 If you have any questions or require additional information, please contact Bryan Ford at (508) 830-8403.
I declare under penalty of perjury that the foregoing is true and correct. Executed on the J/i,, day of August 2002.
Sincerely, Richard M. Bellamy
Enclosure:
Evaluation of the Proposed Changes - 6 pages Attachments: 1. Proposed Technical Specification and Bases Changes (mark-up) - 10 pages
- 2. List of Regulatory Commitments - 1 page 202065
Entergy Nuclear Operations, In6. Letter Number: 2.02.065 Pilgrim Nuclear Power Station Page 3 cc: Mr. Travis Tate, Project Manager Office of Nuclear Reactor Regulation Mail Stop: 0-8B-1 U.S. Nuclear Regulatory Commission 1 White Flint North 11555 Rockville Pike Rockville, MD 20852 U.S. Nuclear Regulatory Commission Region 1 475 Allendale Road King of Prussia, PA 19406 Senior Resident Inspector Pilgrim Nuclear Power Station Mr. Steve McGrail, Director Mass. Emergency Management Agency 400 Worcester Road P.O. Box 1496 Framingham, MA 01702 Mr. Robert Hallisey Radiation Control Program Commonwealth of Massachusetts Exec Offices of Health & Human Services 174 Portland Street Boston, MA 02114 202065
ENCLOSURE Evaluation Of The Proposed Changes
Subject:
Relocation of Certain Control Rod Block Functions to the Final Safety Analysis Report
- 1. DESCRIPTION
- 2. PROPOSED CHANGES
- 3. BACKGROUND
- 4. TECHNICAL ANALYSIS
- 5. REGULATORY SAFETY ANALYSIS 5.1 No Significant Hazards Consideration
- 6. ENVIRONMENTAL CONSIDERATION
- 7. COORDINATION WITH OTHER PENDING TS CHANGES
- 8. REFERENCES
- 1. Description This letter is a request to amend Operating License DPR-35 for Pilgrim Nuclear Power Station.
This proposed license amendment would relocate certain Control Rod Block functions from Technical Specifications (TS) 3/4.2.C, "Instrumentation that Initiates Rod Blocks," to the Updated Final Safety Analysis Report (UFSAR).
This change is consistent with Standard Technical Specifications (NUREG 1433, Revision 2) and changes previously approved by the NRC for other reactor licensees. Entergy has reviewed the proposed amendment in accordance with 10 CFR 50.92 and concludes it does not involve a significant hazards consideration. Entergy requests approval of the proposed amendment by March 31, 2003 to support Pilgrim's upcoming refueling outage (scheduled to commence on April 19, 2003).
- 2. Proposed Change The proposed change is to relocate the following Control Rod Block functions from TS 3/4.2.C to the UFSAR.
A. Average Power Range Monitors (APRMs)
- 1. APRM Upscale (Flow Biased)
- 2. APRM Upscale
- 3. APRM Inoperative
- 4. APRM Downscale B. Intermediate Range Monitors (IRMs)
- 1. IRM Upscale
- 2. IRM Detector not in Startup Position
- 3. IRM Inoperative
- 1. SRM Upscale
- 2. SRM Detector not in Startup Position
- 3. SRM Inoperative
- 4. SRM Downscale D. Scram Discharge Volume Water Level
- 1. Scram Discharge Instrument Volume Water Level - High
- 1. Recirculation Flow Converter- Upscale
- 2. Recirculation Flow Converter- Inoperative
- 3. Recirculation Flow Converter - Comparator Mismatch All associated current TS requirements and TS Bases information will be relocated to the UFSAR as part of this change. This change is consistent with Standard TS, General Electric Plants, BWR/4, (NUREG-1433, Revision 2) and changes previously approved by the NRC for other reactor licensees. Also included in Attachment 1 are the associated Bases changes that will be made as part of implementation of the proposed changes.
1
- 3. Background Control rods provide the primary means for control of reactivity changes. The control rod block instrumentation is designed to ensure that specified fuel design limits are not exceeded for postulated transients and accidents.
During high power operation, the rod block monitor provides protection for control rod withdrawal error events. During low power operations, control rod blocks from the rod worth minimizer enforce specific control rod sequences designed to mitigate the consequences of the control rod drop accident. During shutdown conditions, control rod blocks from the Reactor Mode Switch in Shutdown Position Function ensure that all control rods remain inserted to prevent inadvertent criticalities.
The purpose of the rod block monitor is to limit control rod withdrawal if localized neutron flux exceeds a predetermined setpoint during control rod manipulations. It is assumed to function to block further control rod withdrawal to preclude a MCPR Safety Limit violation. The rod block monitor supplies a trip signal to the reactor manual control system (RMCS) to appropriately inhibit control rod withdrawal during power operation above the low power range setpoint. The rod block monitor has two channels, either of which can initiate a control rod block when the channel output exceeds the control rod block setpoint. One rod block monitor channel inputs into one rod block circuit and the other channel inputs into the second rod block circuit. The rod block monitor channel signal is generated by averaging a set of local power range monitor (LPRM) signals at various core heights surrounding the control rod being withdrawn. A signal from one APRM channel assigned to each Reactor Protection System (RPS) trip system supplies a reference signal for the rod block monitor channel in the same trip system. This reference signal is used to determine which rod block monitor range setpoint (low, intermediate, or high) is enabled. The requirements associated with the rod block monitor function will continue to be controlled by TS 3/4.2.C and are not modified by the proposed TS changes.
The purpose of the rod worth minimizer is to control rod patterns during startup, such that only specified control rod sequences and relative positions are allowed over the operating range from all control rods inserted to 20% rated thermal power. The sequences effectively limit the potential amount and rate of reactivity increase during a control rod drop accident. Prescribed control rod sequences are stored in the rod worth minimizer, which functions to initiate control rod withdrawal and insert blocks when the actual sequence deviates beyond allowances from the stored sequence. The rod worth minimizer determines the actual sequence based on position indication for each control rod. The requirements associated with the rod worth minimizer function will continue to be controlled by TS 3/4.3.F and are not modified by the proposed TS changes.
With the reactor mode switch in the shutdown position, a control rod withdrawal block is applied to all control rods to ensure that the shutdown condition is maintained. This prevents inadvertent criticality as the result of a control rod withdrawal when the reactor is shutown. The reactor mode switch has two channels, each inputting into a separate RMCS rod block circuit.
A rod block in either RMCS circuit will provide a control rod block to all control rods. The requirements associated with the rod block monitor function will continue to be controlled by TS 3/4.2.C and are not modified by the proposed TS changes.
2
In addition to these functions assumed in the accident analysis, control rod block instrumentation also provides information to the operators to help prevent an unnecessary RPS automatic actuation (scram trip signal) and also provides indication of reactor power and core flow conditions and other information. The control rod block instrumentation provides this function by blocking control rod movement when specific conditions occur. These functions (e.g., APRM, IRM, SRM, Scram Discharge Volume Water Level, and Recirculation Flow Converter control rod blocks) are the functions that are to be relocated from the TS to the UFSAR.
The APRMs provide information about average core power. This average core power information is used by the control rod block instrumentation to generate a control rod block prior to the RPS actuation setpoint and in the case of the Flow Biased rod block, provide indication to the reactor operator concerning the boundary of the restricted region for reactor core stability purposes. The APRM rod blocks are not capable of providing the local power information required to mitigate rod withdrawal errors or rod drop accidents and are not credited to mitigate any design basis accident or transient.
The IRMs and SRMs are provided to monitor the neutron flux levels during shutdown, refueling, and startup conditions. This information is used by the control rod block instrumentation to generate a control rod block prior to the RPS actuation setpoint. The IRM and SRM rod blocks are not credited to mitigate any design basis accident or transient.
The purpose of measuring the Scram Discharge Volume Water Level is to ensure there is sufficient volume remaining to contain the water discharged by the CRDs during a scram, thus ensuring the control rods are able to insert fully. This rod block signal provides an indication to the operator that water is accumulating in the Scram Discharge Volume and prevents further rod withdrawals. With continued water accumulation, an RPS automatic scram will occur. Thus, the Scram Discharge Volume water level control rod block signal provides an opportunity for the operator to take action to avoid a subsequent scram. The Scram Discharge Volume Water Level rod blocks are not credited to mitigate any design basis accident or transient.
The Recirculation Flow Converter control rod blocks function to monitor for failure of the Recirculation Flow Converter. Failure(s) of a Recirculation Flow Converter can result in an increase or a mismatch in reactor recirculation flow. An increase in reactor recirculation flow causes an increase in neutron flux that results in an increase in reactor power. This increase in neutron flux is monitored by the APRM RPS instrumentation while flow mismatches are controlled by TS 3.6.F. The Recirculation Flow Converter rod blocks are not credited to mitigate design basis accidents or transients.
Relocating these requirements to the UFSAR will allow revisions in accordance with 10 CFR 50.59 without requiring a license amendment. Any change of the relocated specifications in the UFSAR will be controlled in accordance with the provisions of 10 CFR 50.59.
- 4. Technical Analysis Section 182a of the Atomic Energy Act of 1954, as amended (the Act) requires applicants for nuclear power plant operating licenses to include the TSs as part of the license. The Commission's regulatory requirements related to the content for the TSs are set forth in 10 CFR 50.36. That regulation requires the TSs include items in eight specific categories. The categories are (1) safety limits, limiting safety system settings, and limiting control settings; (2) limiting conditions for operation; (3) surveillance requirements; (4) design features; (5) administrative controls; (6) decommissioning; (7) initial notification; and (8) written reports.
However, the regulation does not specify the particular requirements to be included in a plant's TSs.
3
The Commission amended 10 CFR 50.36 (60 FR 36593, July 19,1995), and codified four criteria to be used in determining whether a particular matter is required to be included in a limiting condition for operation (LCO) as follows: (1) Installed instrumentation that is used to detect, and indicate in the control room, a significant abnormal degradation of the reactor coolant pressure boundary; (2) a process variable, design feature, or operating restriction that is an initial condition of a design-basis accident or transient analysis that either assumes that failure of, or presents a challenge to, the integrity of a fission product barrier; (3) a structure, system, or component that is part of the primary success path and which functions or actuates to mitigate a design-basis accident or transient that either assumes the failure of, or presents a challenge to, the integrity of a fission product barrier; or (4) a structure, system, or component which operating experience or probabilistic safety assessment has shown to be significant to public health and safety. LCOs and related requirements that fall within or satisfy any of the criteria in the regulation must be retained in the TSs, while those requirements that do not fall within or satisfy these criteria may be relocated to licensee-controlled documents. Pilgrim's UFSAR is one such licensee-controlled document.
The proposed changes are consistent with the Standard TS for General Electric plants (NUREG-1433) and 10 CFR 50.36. NUREG-1433 does not include the control rod block functions that are requested to be removed from the TS. In addition, the criteria in 10 CFR 50.36 for features required to be retained in TSs do not apply. The NRC's Final Policy Statement recommends that TSs that do not meet the screening criteria for retention may be relocated to a licensee-controlled document. The four criteria of 10 CFR 50.36 are addressed below:
(1) These control rod block functions do not have the ability to detect abnormal degradation of the reactor coolant pressure boundary. Therefore, these control rod block functions do not satisfy Criterion 1.
(2) These control rod block functions provide information to the operators to help prevent unnecessary reactor protection system automatic actuations (scrams) and indication of reactor power and core flow conditions. However, these control rod block functions are not explicitly considered in the accident analysis and are not considered a required initial condition for a design basis accident or transient. Therefore, these control rod block functions do not satisfy Criterion 2.
(3) These control rod block functions provide information to the operators to help prevent unnecessary reactor protection system automatic actuations (scrams) and indication of reactor power and core flow conditions. However, These control rod block functions are not explicitly considered in the accident analysis. These control rod block functions are not a primary success path for accident mitigation; therefore they do not satisfy Criterion 3.
(4) Operating experiences or probabilistic safety assessments have not shown these control rod block functions to be significant to public health and safety. Therefore, These control rod block functions do not satisfy Criterion 4.
These control rod block functions will be relocated to the UFSAR. Any changes to these requirements will be strictly controlled under the provisions of 10 CFR 50.59. Therefore, the relocation of these control rod block functions specifications from the TSs to the UFSAR will continue to provide adequate assurance that functionality and testing of the control rod blocks will be assured as necessary.
4
In conclusion, the relocated requirements are not required to be in the TS under 10 CFR 50.36 or section 182a of the Atomic Energy Act, and are not required to obviate the possibility of an abnormal situation or event giving rise to an immediate threat to the public health and safety. In addition, sufficient regulatory controls exist under 10 CFR 50.59 to assure continued protection of public health and safety.
- 5. Regulatory Safety Analysis 5.1 No Significant Hazards Consideration Pilgrim is proposing to relocate certain Control Rod Block functions from TS 3/4.2.C, "Instrumentation that Initiates Rod Blocks," to the Updated Final Safety Analysis Report (UFSAR).
Pilgrim has evaluated whether or not a significant hazards consideration is involved with the proposed amendment(s) by focusing on the three standards set forth in 10 CFR 50.92, "Issuance of amendment," as discussed below:
- 1. Does the proposed change involve a significant increase in the probability or consequences of an accident previously evaluated?
Response: No.
The proposed change is administrative in nature and does not involve the modification of any plant equipment or affect basic plant operation. These control rod blocks are not assumed to be an initiator of any analyzed event, nor are they assumed in the mitigation of consequences of accidents. Therefore, the proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.
- 2. Does the proposed change create the possibility of a new or different kind of accident from any accident previously evaluated?
Response: No.
The proposed change does not involve any physical alteration of plant equipment and does not change the method by which any safety-related system performs its function. As such, no new or different types of equipment will be installed, and the basic operation of installed equipment is unchanged. The methods governing plant operation and testing remain consistent with current safety analysis assumptions.
Therefore, the proposed change does not create the possibility of a new or different kind of accident from any accident previously evaluated.
- 3. Does the proposed change involve a significant reduction in a margin of safety?
Response: No.
The proposed change is administrative in nature, does not negate any existing requirement, and does not adversely affect existing plant safety margins or the reliability of the equipment assumed to operate in the safety analysis. As such, there are no changes being made to safety analysis assumptions, safety limits or safety system settings that would adversely affect plant safety as a result of the proposed change. Margins of safety are unaffected by requirements that are retained, but relocated from the Technical Specifications to the FSAR. Therefore, the proposed change does not involve a significant reduction in a margin of safety.
5
Based on the above, Entergy concludes that the proposed amendment presents no significant hazards consideration under the standards set forth in 10 CFR 50.92(c), and, accordingly, a finding of "no significant hazards consideration" is justified.
- 6. Environmental Consideration As defined in 10 CFR 20, a review of this TS change determined that the proposed amendment would change a requirement in respect to installation or use of a facility component located within the restricted area, or would change an inspection or surveillance requirement. However, the proposed amendment does not involve (i) a significant hazards consideration, (ii) a significant change in the types or significant increase in the amounts of any effluent that may be released offsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure. Accordingly, the proposed amendment meets the eligibility criterion for categorical exclusion set forth in 10 CFR 51.22(c)(9). Therefore, pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment needs to be prepared in connection with the proposed amendment.
- 7. Coordination With Other Pending TS Changes The mark-ups of TS submitted by Letter Number 2.02.072 for "Changes to Post-Accident Monitoring Instrumentation Requirements", deletes Note (2) on TS page 3/4.2-41. If the reference TS change is approved prior to the approval of this TS change, the final TS page 3/4.2-41 should be consolidated to delete Note (2), in addition to the deletion of Note (3).
- 8. References
- 1. 10 CFR 50.36, 'Technical Specifications"
- 2. NUREG-1433,"Standard Technical Specifications, General Electric Plants, BWR/4" 6
ATTACHMENT 1 PROPOSED TECHNICAL SPECIFICATIONS AND BASES CHANGES (MARK-UP)
PNPS TABLE 3.2.C.1 INSTRUMENTATION THAT INITIATES ROD BLOCKS Operable Channels per Trip Function Minimum I Available Be uired!2pemltional Co~nditions No te S Trip, Function IRMlUps-6a (Flow Biased) 4 0Rn (1)
APRM Upscale 4 6-----_._*_a.rtup/RefueI (1)(8)
APRM Inoperative 4' 6" Run/Startup/Refuel (.)(6)
APRM Downscale 4 6 Run (1)
- Rod Block Monltor(Power 2 2 Run, with limiting control rod pattern, (2)(5)
Dependent) and reactor power > LPSP 2 2 Run, with limiting control rod pattern, (2)(5)
Rod Block Monitor Inoperative and reactor power > LPSP Run, with limiting control rod pattern, (2)(5)
Rod Block Monitor Downscale 2 2 IRM D's-aie-.._ 0 8 Startup/Refuel, except tip is bypassed when IRM (1)(6) w _*j Is on its lowest range (1( 6 la c e" i n r u n
- -- _ Is -p PM Dti o oiR rn o in S a up6*- M t r--8 Startup/Refuel, trip Is bypassed when mode switch (1)(6)
Positin IRM Upscale 6 8 Startup/Refuel Startup/Refuel MUM iRM Inoperative 6 8 VA7 l
Revision 191 1.-1M,293g* 447,16-9169 Amendment No. 45, 27, 65, 1-,l72,-j-~v"7, 142 ] -,II-1 1
, TABLE 3.2.C.1 (Cent)
INSTRUMENTATION THAT INITIATES ROD BLOCKS
"*-* p~er Tri Function.
Operable Channels Required Operational Conditions Notes Trip Function "Mininum Available S.. .Startuo/Refuel. except trip is bypassed when SRM (1)(4)(6)
RHM Detector not in Startup ,J count rate is > 100 counts/second or IRMs on Position Range 3 or above "Startup/Refuel, except trip Is bypassed when IRMs (1)(4)(6 SRM Downscale 3 4
".-,.,onRange 3 or above Startu p tuel, except trip is bypassed when the (1)(4)(6)
SRM Upscale 3 4 IRM range wit hs are on Range 8 or above (4)
Startup/Refuel, exce-pt.rIp is bypassed when the (1)(4)(6 SRM Inoperative 3 4 ange 8 or above (4)
IRM range switches are 2 Run/Startup/Refuel " (3)(6)
Scram Discharge Instrument 2 Volume Water Level - High Refuel/Shutdown (3)(6) 1 1 Scram Discharge Instrument Volume-Scram Trip Bypassed I
Revision 203 3M4.2-20 Amendment No.4-3847-459-i%9, 178
J
- 8 PNPS TABLE 3.2.C.1 (Cont)
INITIATES ROD BLOCKS INSTRUMENTATION "tHAT Operable Channels i PeRIM0ri Fu -Bctirdon~rPv1 u1red g eratlonnl Condltlons I Available Re TrI icttot1 -Minimum 2 Run
- 2 Rb-rdulatl* Flow Converter Upscale 2 2 Run Recirculation Flow Converter-Reactor Mode Switch in 2 2h)
Shutdown Rev~sO~~
9314.2-21
NOTES FOR TABLE 3.2.C-1
- 1. number of operable channels:
- a. One less than r by the minimum operable channels per trip function requirement, restore an !no channel to operable status within 7 days or place an inoperable channel in the tripped c within the next hour.
- b. Two or more less than required by the minimum operable s er trip function requirement, place at least one inoperable channel in the tpped con inone hour.
- 2. a. With one RBM Channel inoperable:
hours; (1) restore the Inoperable RBM channel to operable status within 24 otherwise place one rod block monitor channel in the tripped condition within the next hour, and; (2) prior to control rod withdrawal, perform an instrument function test of the operable REM channel.
- b. With both RBM channels inoperable, place at least one inoperable rod block monitor channel in the tripped condition within one hour.
- 3. nnels !is less than.,,,,.
,,t,,*, _._I If the num *. i ,,.. ,*_.__._.t* .,-*,,n!by ithete required minimum operable within tri ped condition onel channels S per trip function requirement, place t e in ". ..... e
- 4. dunn core alterations are given in echnical Specification k3.10.
- 5. REM operability is required In the run mode in the presence of a limiting rod pattern with exists reactor power greater than the REM low power setpoint (LPSP). A limiting rod pattern when:
MCPR < 1.41 for reactor power ->90%
MCPR < 1.72 for reactor power < 90%
The allowable value for the LPSP is < 29% of rated core thermal power.
- 6. When itch Is in the Refuel position, the reactor vessel head is removed,)
~~a d control rods are inserted in a Cflilfo nI one ormr ul asm le, tese Rodd Block functions are not required. _________________
- 7. With one or more Reactor Mode Switch - Shutdown Position channels Inoperable, suspend control rod withdrawal and initiate action to fully insert all insertable control rods in core cells containing one or more fuel assemblies immediately.
Revi 14 '
AmeniýR o. 4 3/4.2-22
PNPS TABLE 3.2.C-2 CONTROL ROD BLOCK INSTRUMENTATION SETPOINTS TrinFun' o Trij..etDOInt APRi=Fnco (1) (2)
Not Applicable Rod Block Monitor (Power Dependent)
Not Applicable Rod Block Monitor Inoperative Block Monitor Downscale >5/125 of Full Scale Rod Doncale Not Applicable IRM ctor not In Startup Position :S 10811215 of Full Scale IRM Upscale' Not Applicable IRM inoperative osition Not Applicable SRM Detector not in Startu SRM Downscale > 3 counts/second S Up l < 105 counts/second Not Applicable
- SRM Unoperatle 1
Scram Discharge Instrument Volume Water Level - High Not Applicable Scram Discharge Instrument Volume -
Scram Trip Bypassed
< 120 of Full Scale Recirculation Flow Converter - Upscale Not Applicab Recirculation Flow Converter - Inoperative
<8% Flow Deviation Recirculation Flow Converter -
Comparator Mismatch Not.Applicable Mode Switch in Shutdown The trip level setting shall be as specified in the CORE OPERATING UMITS (1) e fu SREPORT.s ;s e refuel or startup positions, the APRM rod REORT.h ore 10 lock trip setpoint shall be le- than alwa s less be <2.0 seconds.
(3) The RBM bypass time delay (td2) shall Revis"' T. 3/42,4 314.2-23 Amendm;t-.
PNPS TABLE 4.2.C FOR CONTROL ROD BLOCKS ACTUATION_
MINIMUM TEST AND CALIBRATION FREQUENCY Celibm~lon Instntment Chec Instrument Functional T-es1 Instru-ment Chann-el nceI3 Months ne3Mnhoc/Ol On
-- AR~D~lCl Once/ Months Once/3 Months Once/3 MonO hsIOMothay Once/Dayy
__RM - Upsca-le Not Applicable APRM - Upeatve Once/3 Months pOr Control Shutdown td (2)(
(2 (e3 -Monh .. Stardtu Startup or C ontrol Shu APRM -U opsca l ve (2) (3)
IRM - Downscale Once/3 Months Once/6 Months oc/a RBM - Upscale t) (3) Not Applicable Oncela Months Once/Day (2)l'hudw---__
IRM-11D Oncel3 Months (2) (3) NotAdupfl~I RBM - Downscale SIRM-U~psraIle NOt Applicable Once/Day RPM D ic e Once/3 Months MWate- le2el)--i2(3)g0 c Intrum t (2 rl3) Not Applcable Not Apiableno otolSud (2)oA SSRM PSRamisc
- Defector _No In -619 jup position (2)3)!
StatuAo r controale Suda (2) .
SSRM - Downscale (2(3*_ (2")o A plc
"-,.... ) (3) Not Appic bl ISIRM - Detector Not In Startup Position
-* '"-* o o~cbeNtApial
- Water Level-High Volume-Scram Trip Bypassed OnceIny Not Applicable Op7Ope ting Cycle Onice/Dlay Recirculltion Flow Converter OnceI3 Months OnceI3 Months Recirculation Flow Converter-Upscalft Not Applicable Ofcl~fltJY Recirculationi Flow Converter-lInoperativfl Once/3 Months ncelDay OnceI3 Months OflceI3 Months Recirculti~ton Flow Converter-ComTpatIntor
,,_.,I;M .. Not Applicble Recirculation Flow P ross Instruments Not A plcable Cycle --.... Not Applicable Once/Operallng Mode Swilch In Shutdown j.llc SyseMj Fundtional Test (4) (6)
System Logic Check OncelOperating Cycle 3/4.2-35 AmenvismI1P-. B 4Q-430r4474-.4
NOTES FOR TABLES &.2.A THROUGH 4.2.G
- 1. Initially once per month until exposure hours (M as defined on Figure 4.1.1) is 2.0 x 105; thereafter, according to Figure 4.1.1 with an interval not les than one month nor more than three months.
- 2. Functional tests, calibrations and instrument checks are not required when these instruments are not required to be operable or are tripped. Functions startup with a required frequency not t tests shall be performed before each exceed once per week. Calibrations of IRis and SRMs shall be performed during each startup or during controlled shutdowns with a required frequency not to exceed once per week. Instrument checks shall be performed at least once per day during those periods when the instruments are required to be operable.
Ti .. .. ..... °- functional test definition.
ate functional test will consist of injecting a simu thee mneasurrement channel.
- 4. Simulated automatic actuation shall be performed once each operating cycle.
Where possible, all logic system functional tests will be performed using t1 test jacks.
- 5. Reactor low water level and high drywell pressure are not included on Table 4.2.A since they are tested on Tables 4.1.1 and 4.1.2.
- 6. The logic system functional tests shall include a calibration of time delay relays and timers necessary for proper functioning of the trip systems.
- 7. Calibration of analog trip units will be performed concurrent with functiona testing. The functional test will consist of injecting a simulated electrical signal into the measurement channel. Calibration of associated analog transmitters will be performed each refueling outage.
R e vi s o 4 Amendmen oN.4421-99*,-l1Q--147; -14 3/4.2-41
BASES:
3.2 PROTECTIVE INSTRUMENTATION (Cont)
The HPCI high flow and temperature instrumentation are provided to detect a break in the HPCI steam piping. Tripping of this instrumentation results in actuation of HPCI isolation valves. Tripping logic for the high flow is a 1 out of 2 logic, and all sensors are required to be operable.
Temperature is monitored at three (3) locations with four (4) temperature sensors at each location. Two (2) sensors at each location are powered by "A" direct current control bus and two (2) by "B" direct current control bus.
Each pair of sensors, e.g., "A" or "B", at each location are physically separated and the tripping of either "A" or "B" bus sensor will actuate HPCI isolation valves.
The trip settings of 5 300% of design flow for high flow and 200°F or 170°F, depending on sensor location, for high temperature are such that core uncovery is prevented and fission product release is within limits.
The RCIC high flow and temperature instrumentation are arranged the same as that for the HPCI. The trip setting of5 300% for high flow and 200"F, 170°F and 150"F, depending on sensor location, for temperature are based on the same criteria as the HPCI.
The Reactor Water Cleanup System high flow and temperature instrumentation are arranged similar as that for the HPCI. The trip settings are such that core uncovery is prevented and fission product release is within limits.
The instrumentation which initiates CSCS action is arranged in a dual bus system. As for other vital instrumentation arranged in this fashion, the Specification preserves the effectiveness of the system even during periods when maintenance or testing is being performed. An exception to this is when logic functional testing is being performed.
The control rod block functions are provided to prevent excessive control rod withdrawal. The trip logic for this function is 1 out of n: e.g., any trip on one of x APRM's) two I*' eig s, or four SRM' will result in a rod block. R--IBK The minimum instrument channel requirements assure sufficient instrumentation to assure the single failure criteria is met. The minimum instrument channel requirements for the RBM may be reduced by one for not longer than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> without significantly increasing the risk of an inadvertent control rod withdrawal.
Reactor power may be varied y moving contro or y varying the cu a ion - e APRM system provides a control rod block to prevent rod withdrawal beyond a given hereby possily avoiding an APRM1 Scram. The rod block setpoint is automatically re uc recirculation flow to form the upper boundary of the PNPS power/flow map. Te .ased APR14 rod block is not necessary to prohibit fuel damage and is not include the analysis of anticipated transients.
Revi io 4- 4 4B . 3 Amen nt No v15Q-ll B3/4.2-3
BASES:
3.2 PROTECTIVE INSTRUMENTATION (Cont)
The RBM rod block function provides local protection of the core, for a sing rod withdrawal error from a limiting control rod pattern.
The'RBM bypass time delay (td2) is the delay between the time the signal is normalized to- the reference signal and the time the signal is passed to the trip logic. Control rod withdrawal is unrestricted during this interval. Ti RBX bypass time delay is low enough to assure that control rod movement is minimized during the time RBM trips are bypassed.
The IRM rod block function provides local as well as gross core protectioin"\.
in arrangement is such that trip setting is less than a factor of Ic above the in level.
A downscale indication on an` ýREBM or IRM is an indication the instrument has failed or the instrument is not s tive enough. In either case the Instrument will not respond to changes in co rod 1 motion and thus, contro "rodmotion is prevented. The dovnscale trips are a own in Table 3.2.C-2.
.1The .rI flow comparator and scram discharge volume high level cop ts have onl one logic channel and are not required for safety.
The refueling interlocks also operate one logic channel, and are required for safety only when the mode switch is in the refueling position.
For effective emergency core cooling for small pipe breaks, the HPCI system must function since reactor pressure does not decrease rapidly enough to allo, either core spray or LPCI to operate in time. The automatic pressure relief
- function is provided as a backup to the HPCI in the event the HPCI does not operate. The arrangement of the tripping contacts is such as to provide this function when necessary and minimize spurious operation. The trip settings given in the specification are adequate to assure the above criteria are met.
' maintenance, The specification preserves testing the effectiveness of the system during periods of or calibration, and also minimizes the risk of inadvertent operation; i.e., only one instrument channel out of service.
Four radiation monitors are provided which initiate the Reactor Building Isolation and Control System and operation of the standby gas treatment system. The instrument channels monitor the radiation from the refueling area ventilation exhaust ducts.
Four instrument channels are arranged in a 1 out of 2 twice trip logic.
RAmqenda.j.j-2-l;193a-g B3/4.2-4
NASES:
4.2 PROTECTIVE INSTRUMENTATION (Cont)
--- lSar"--icn and PCIS common to RPS instrumentation have and instr S Block Control Rod Controlsand sure-*_an maintenance outage times selected in accordance p yets -an2asas. pproved by the NRC and documented wit N~c3051. 4 C. E. os-in SEPs (letters to D. N. Grace from Jan ary 6, 19895.--
to minimize interval of 24 months was selectedto minimize A logic system functional test and inoperability due to testing attendant the frequency of safety system system trips and their safety the potential for inadvertent transients.
I B/ 21 Rev B3/4.2-11
ATTACHMENT 2 LIST OF REGULATORY COMMITMENTS
List of Regulatory Commitments The following table identifies those actions committed to by Pilgrim in this document. Any other statements in this submittal are provided for information purposes and are not considered to be regulatory commitments.
REGULATORY COMMITMENT DUE DATE Relocate the control rod block 60 days following approval of the amendment.
requirements removed from the Technical Specifications and Technical Specifications Bases to FSAR.