ML20139A310
| ML20139A310 | |
| Person / Time | |
|---|---|
| Site: | Hope Creek  |
| Issue date: | 10/01/1985 |
| From: | Churchman C, Opasl P, Singh S Public Service Enterprise Group |
| To: | |
| Shared Package | |
| ML20139A279 | List: |
| References | |
| PSE-SE-Z-019, PSE-SE-Z-19, NUDOCS 8510080428 | |
| Download: ML20139A310 (8) | |
Text
PUBLIC SERVICE ELECTRIC AND GAS COMPANY-HOPE CREEK PROJECT SAFETY EVALUATION No. PSE-SE-2-019 TITLE:
DELETION OF TEST NUMBER 28B, TWO PUMP RECIRCULATION PUMP TRIP TEST AT TEST CONDITION 3 OCT 011985 Date:
1.0 PUR POS E The purpose of this Safety Evaluation is to document the results of the evaluation performed to ensure that deletion of Test Number 28B, Two Recirculation Pump Trip Test at Test Condition 3, from Hope Creek's Power Ascension Test Program, will not adversely affect reactor safety.
2.0 SCOPE The area of, concern for,this proposed. change is the.,
adequacy of Hope Creek 's Power Ascehsion Test Program.
3.0 REFERFNCES 1.
Regulatory Guide 1.68, Revision 2, August 1978 2.
Hope Creek Final Safety Analysis Report (FSAR) 3.
General Electric Startup Specification, 23A4137 Revision 0 4.
Hope Creek Generating Station Draft Technical Specifications 5.
General Electric Preoperational Tes t Program Specification 22A2271AZ, Revision 2 4.0 DISCUSSION Regulatory Guide 1.68 (Revision 2, August 1978), Appendix A, paragraph 5.1.1 requires that the dynamic response of the plant is in accordance with design for limiting reactor coolant pump trips.
The method for initiating the pump trip should result in the fastest credible coastdown in flow for the system while operating at approximately 100% power.
Hope Creek's Power Ascension Testing Program includes a two pump trip test at both Test Condition 3 (approximately 100% core flow and 50%
power) by Test Number 28B and Test Condition 6 8510080428 851004 PDR ADOCK 05000354 A
- PSE-SE-2-019 1 of 3
(approximately 100% core flow and 100% power) in conjunction with the Generator Load Rejection Test, Test Number 25.
Performance of the two pump trip test at Test Condition 6 will satisfy the intent of Regulatory Guide 1.68, Appendix A, paragraph 5.i.i.
It is therefore proposed to delete performance of this test at Test Condition 3 (Test Number 28B ).
The acceptance criteria for the two pump trip test requires drive coastdown transient parameters to be within those used in the transient analysis of the Hope Creek Final Safety Analysis Report (FSAR).
This criteria is the sole acceptance criteria of the two pump trip test at Test Condition 3 (Test Number 28B) and is included in the acceptance criteria for the two pump trip which will result at Test Condition 6 due to the high power turbine generator trip test (Test Number 25).
Hope Creek's FSAR states that the two pump trip test at Test Condition 3 will verify the performance of the Recirculation Pump Trip (RPT) circuit and the recirculation pump flow coastdown prior to the high power turbine generator trip tes.t. (Test: Co,nditi'on. 6;).
- However, the performance'of the RPT circult is also verified by preoperational tests.
In addition, the recirculation pump coastdown performance will be observed during single pump trip tests which will be performed with one pump at Test Condition 3 and the other pump at Test Condition 6.
These tests are prerequisites to the two pump trip test.
Furthermore, the characteristics of coastdown are well understood and have been demonstrated during power ascension testing at other plants.
The margin to safety has always been maintained and no additional safety risk is incurred by not performing this test prior to Test Condition 6.
5.0 CONCLUSION
Performance of the Two Recirculation Pump Trip test at Test Condition 6 satisfies the intent of Regulatory Guide 1.68, Appendix A, paragraph 5.i.i.
Deletion of this test at Test Condition 3 will not affect any safety related systems or safe operation of the plant and Technical Specification change is not required.
Based on the above, deletion of this test does not involve an unreviewed safety question.
Therefore, Test Number 28B, Two Recirculation Pump Trip, can be deleted from Hope Creek's Power Ascension Testing Program.
PSE-SE-Z-019 2 of 3
6.0 DOCUMENTS GENERATED None 7.0 RECOMMENDATIONS Revision to Hope Creek's FSAR and startup test procedures shall be made to delete the Two Pump Recirculation Pump Trip Test at Test Condition 3, Test Number 288, from the Hope Creek Power Ascension Test Program.
8.0 ATTACHMENTS None 9.0 SIGNATURES Originator 8:0 h C,. W C_
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M PSE-SE-Z-019 3 of 3
TEST NUMBER 28D - RECIRCULATION PUMP RUNBACK IN CONJUNCTION WITH TEST hUMBER 21C OBJECTIVE:
Regulatory Guide 1.68, (Revision 2, August 1978), Appendix A, paragraph 5.s requires that the recirculation flow control system be calibrated as necessary and its performance verified.
One function of the recirculation flow control system is to provide a recirculation pump runback upon the coincident loss of one feedwater pump and low water level (Level 4) indication to avoid scram on low-low water level (Level 3).
Tes t Number 28D, Recirculation Pump Runback,
simulates a loss of feedwater pump at Test Condition 3 near rated recirculation flow to determine the adequacy of the recirculation pump runback feature in preventing a scram.
It is proposed to perform this test in conjunction with Test Number 21C, Feedwater Pump Trip at Test Condition 6.
This testing will demonstrate that Regulatory Guide 1.68, Appendix A, paragraph 5.s objectives are met for the recirculation pump runback feature of the recirculation flow control system.
DISCUSSION:
Response of the system during a feedwater pump trip with recirculation pump runback is determined by analyzing test data and comparing to acceptance criteria which define the required system performance.
For the recirculation pump runback test, the recirculation pumps are required to runback upon a trip of the runback circuit.
During Test Number 21C, Feedwater Pump Trip at Test Condition 6, a recirculation pump runback occurs as the result of the feedwater pump trip.
This testing results in an actual demonstration of the recirculation pump runback circuit under real as opposed to simulated conditions.
CONCLUSION:
Testing of the recirculation pump runback feature in conjunction with the Feedwater Pump Trip test at Test Condition 6 demonstrates the actuation of the recirculation pump runback circuits and provides a demonstration of the adequacy of the runback feature to prevent scram.
This proposed testing satisfies the objectives of Regulatory Guide 1.68, Appendix A, paragraph 5.s for the recirculation pump runback feature of the recirculation flow control system and will not affect any safety related systems or safe operation of the plant and 4
therefore does not involve an unreviewed safety question.
Therefore, Test Number 28D, Recirculation Purap Runback, can be performed in conjunction with Test Number 21D, Feedwater Pump Trip at Test Condition 6.
1
O ATTACHMENT 2
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(1) Test conditione refer to plant condition.
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l (2) Perfom Test 5, timing of 4 slowest control l
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between test condition. I and 3 l 4 l rull Core shutdown Margia lI l
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(4) Af ter recirculation pump tripe (natural l 6 l SRM Performance lX l
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circulation) l e l Ist Performance l
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l (5) Setween 80 and 90 percent themel power, l O l APite Calibratica l
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l (6) Max FW Smaut Capability & Bacirc Pump l 13 l MPCI l
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Runback must have already been completed l 14 l Belected Process Temp l
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l (7) Reactor power between 80 amt 90 percent l 15 l snten Exp neton lE lE lE II l
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l (8) Reactor power betwasa 45 and 65 percent l 17 l Core n rformance l
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(9) Reactor power between 75 and 90 percent l 19 l Core Pwr-void Mode Responsel l
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l (10) At maximum power that will act cause scram l 21 l rem sye-setgoint Changes l l3 lE lX lI lE lI lI l
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(!!) Perform betwua test conditione 1 and 3 l as l remsweter Pump Trip l
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(12) Reactor gewer between 40 and 55 percent l 22 l Turbine Velve surveillance l l
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l (13) Reactor power between 60 and 85 percent l 23 l MSIV Functional Test l
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(14) Between test conditions 2 and 3 l 25 l Turbine Trip 6 Imad l
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(15) Cenerator load rejection, within bypass l 26 l Shutdown outside CRC l
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l (16) Reactor power between 60 and 80 percent I " ' r _' ; - -.
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(17) Load rejection l 20 l Recirc sys Cavitatica l
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l (21) Performed dhiring cooldown fece test FINAL SAFETY ANALYSIS REPORT l 40 l Confirmatory in-Plant Test l l
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l condition 6 FSAR 3/7 (22) The test number correlates to rs4R section TEST SCHEDULE AND CONDITIONS 14.2.12.3.a mere a is the indicated test number.
i FIGURE 14 2 5 Amendmons10.06/56 o
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HCGS FSAR 10/84 14.2.12.3.28 Recirculation System a.
Objectives 1.
To determine transient responses and steady-state conditions following recirculation pump trips at selected power levels 2.
To obtain recirculation system performance data 3.
To verify that cavitation in the recirculation system does not occur in the operating region of the power / flow map.
4.
To verify the adequacy of the recirculation runback to mitigate a scram upon loss of one feedwater pump.
5.
To verify that the feedwater control system can control water level without causing a turbine trip / scram following a single recirculation pump trip.
6.
To demonstrate the adequacy of the recirculation pump restart procedure at the highest possible power level.
b.
Prerequisites l
l The reactor is operating at steady-state conditions at required power level.
I c.
Test Method
{
Single pump trips are performed at test condition 3 and l
6.
7" r trip ir dr rnetrated at teet ce=ditica 3 The one-pump trip tests are to demonstrate that water l
level will not rise enough to threaten a high level trip of the main turbine or the feedwater pumps.
The d"sl p"sp trip verifies the perfer :r.cc Of the RPT l
14.2-189 Amendment 8 l
1
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circuit :nd the recircul: tier pur; flee ::::tdcen prior te th: high per : turbin: ;:ncr:ter trip t :tc.
Single i
pump trips are initiated by tripping the MG set generator output breaker.
Adequate margins to scrams and capability of the feedwater system to prevent a high level trip will be monitored.
The tre pr p trip aill be initirted by ci= cit:ne ::!y tripping b:th recirculatien RPT breakere usin; a test seitch The recirculation pump restart demonstrates the adequacy of the restart operating procedure at the highest possible power level.
At several power and flow conditions, and in conjunction with single pump trip recoveries, recirculation system parameters are recorded.
At test conditier 3 ndatkeer::tedrecircul: tin
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- fleu, 10;: Of : f : duct : p :p i: cimul:ted.
This i dene prior te en-actu:1 f::de:ter pe=p trip te determine the adequecy cf recirculatier pu p runback f :ture ir prefer. ting : cer:r s
While at test condition 3, it will be demonstrated that the cavitation interlocks which runback the recirculation pumps on decreased feedwater flow are adequate to prevent operation where recirculation pump j
or jet pump cavitation can occur.
d.
Acceptance Criteria Level 1:
1.
During recevery from one pump-trip, the reactor shall not scram.
2.
The tre purp iri : fler ceertder-time fellerin; deel recirculatier per; trip i: :: 0; :ified in th OS :t:: tup tcet pecific ti n.
Level 2:
1.
Neutron flux, heat flux, and reactor water level scram avoidance margins are as specified in the GE startup test specification.
l 14.2-190 Amendment 9 l --
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