ML20133A375

Simplification of Power Ascension Test 20,Pressure Regulator. Modified Test 20 Encl

ML20133A375
Person / Time
Site:	Hope Creek
Issue date:	09/25/1985
From:	Atkinson C, Lambert C Public Service Enterprise Group
To:
Shared Package
ML20133A355	List: ML20133A352 ML20133A375 ML20133A401
References
PSE-SE-Z-020, PSE-SE-Z-20, NUDOCS 8510020200
Download: ML20133A375 (6)

Text

O PUBLIC SERVICE ELECTRIC AND GAS COMPANY HOPE CREEK PROJECT SAFETY EVALUATION No. PSE-SE-2-020 TITLE:

SIMPLIFICATION.OF POWER ASCENSION TEST NUMBER 20, PRESSURE REGULATOR Date: SEP 2 51985 1.0 PUR POSE The purpose of this Safety Evaluation is to document the results of the evaluation performed to ensure that deletion of the pressure regulator tests at Test Condition 4, the backup pressure regulator takeover testing at Test Condition 5, and the automatic load following mode tests at Test Conditions-3 and 6 from the Hope Creek power ascension test program will not adversely affect reactor, safety.

.2.0 SCOPE

~

3 The area of concern for this proposed change.is the adequacy of Hope Creek 's power ascension tes t program.

3.0 REFERENCES

1.

2. Regulatory Guide 1.68, Revision 2, August 1978 Hope Creek Final Safety Analysis Feport (FSAR)

Chapter 14

3. General Electric Startup Specification, 23A4137 Revision 0

4. Hope Creek Generating Station Draft Technical Specifications

5. Draft Hope Creek Power Ascension Test Number TE-SU.BB-221, Pressure Regulator Test - Control valves Controlling

6. Draft Hope Creek Power Ascension Test Number TE-SU.BB-223, Pressure Regulator Test - Bypass Valves Controlling i

PSE-SE-2-020 1 of 3 h

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4.0 DISCUSSION Regulatory Guide 1.68 (Revision 2, August 1978), Appendix A, paragraphs 4.u and 5.s require demonstration of the operability of the pressure regulator system during low power testing and its calibration and performance verification 20, during power ascension testing. Test Number Pressure Regulator, determines the response of the system to rapid pressure setpoint changes in order to optimize regulator settings . Also, at specified test conditions, the load limit setpoint will be set so that the transient is handled by control and/or bypass valves.

Performance of the Pressure Regulator test is planned for Test Conditions 1 through 5. It is proposed to delete the pressure regulator tests at Test Condition 4,

the backup pressure regulator takeover testing at Test Condition 5 and the automatic load following mode tests at Test Conditions 3 and 6.

Deletion of all Test Condition 4 testing is justified in Safety Evaluation PSE-SE-2-008. Deletion of automatic load following mode tests is justified in Safety Evaluation PSE-SE-2-002.

,~Takeove.r testing of the.b.ackup' pressure regulator is currently 3, 5, and 6.

pla'nned to be per' formed at Test Conditions 2, Takeover testing a t . Test Condition 5 is bounded by testing a t Tes t Conditions 2, 3, and 6'(See Attachment 1). Thus, testing at Test Conditions 2, 3, and 6 adequately demonstrates the capability of the backup pressure regulator to control pressure in the event of a failure of the controlling pressure regulator.

Furthermore, all other tests of the pressure regulators regulators at Test Condition 5, some of which subject the to transients as severe or more severe than a failure of the controlling regulator, will be performed so that the behavior of the regulators at Test Condition 5 will be adequately determined.

5.0 CONCLUSION

S Deletion of Test Condition 4 and automatic load following mode testing was previously addressed and was found not to involve unreviewed safety questions. Deletion of takeover testing of the backup pressure regulator at Test Condition 5 does not adversely affect any safety systems or safe operation of the plant and, therefore, also does not involve an unreviewed safety question.

No Technical PSE-SE-2-020 2 of 3 1

.. o l Specifications changes are required. The remaining  ;

testing meets the requirements of Regulatory Guide 1.68 '

(Revision 2, August 1978), Appendix A, paragraphs 4.u and 5.s. The Pressure Regulator test can therefore be simplified by deleting the portions of the test as discussed above.

6.0 DOCUMENTS GENERATED None 7.0 RECOMMENDATIONS Revisions to power ascension test procedures and the Hope Creek FSAR shall be made to reflect the simplification of the Pressure Regulator test described above.

8.0 ATTACHMENTS Hope Creek's Operational Power / Flow Map.

9.0 SIGNATURES Originator ~

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• /2f/9C Group Head (or SSSI /fA m% f /5-SystemsAnalysisGroupHead[. h b bH).O Y/ /6 Site Engineering Manager ~

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Datf PSE-SE-2-020 3 of 3

ATTACHMENT 1 NUCLEAR ENERGY 2 m 137 2

SUSINESS OPERATIONS - GENERAL $ ELECTRIC Rev 0 140 130 130 -

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A. NATURAL CIRCULATION 1e9 "

8. 800N6440M REClRCULATION PuesP MED C. ANALYTICAL LouutR LatelT OF %y IIASTER POtutR Plow CONTROL g - D. ANALYTICAL UPPER LiedIT OF GIASTER POuutR PLOut COesTROL 4 .

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. Figure 1. Operational Power / Flow Map ase eern enev. iefei

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4 TEST, NUMBER 20 - PRESSURE REGULATOR TEST SIMPLIFICATION - REDUCED NUMBER OF TESTS OBJECTIVE:

Regulatory Guide 1.68 (Revision 2; August 1978), Appendix A, paragraphs 4.u and 5.s require demonstration of the operability during low power testing and calibration and performance verification during power ascension testing of the pressure regulator system. Test Number 20, Pressure Regulator, determines the response of the system to rapid pressure setpoint changes and at specified test conditions the load limit setpoint will be set so that the transient is handled by control and/or bypass valves. Backup pressure regulator takeover will be tested by simulating a failure of the selected pressure regulator and regulator settings will be optimized.

Performance of this test is planned for Test Conditions 1-6.

It is. proposed to delete the pressure regulator tests and Test Condition 4, the backup pressure regulator takeover testing at Test Condition 5 and the automatic load following mode tests at Test Conditions 3 and 6.

EDI'SCUSSION:- ~

Acceptance criteria, level 1, level 2, and level 3, specify acceptable performance of the pressure regulator system.in response to testing perturbations. Level 1 and 2. criteria require that the transient response of any pressure control system-related variable to any test input must be non-divergent. Further, level 2 criteria require that the pressure response time for pressure setpoint changes and the pressure control system deadband or delay be small enough to produce steam flow variations within prescribed limits. Also, the level 2 criteria require that peak values for neutron flux and vessel pressure during the pressure regulator failure transients do not exceed prescribed limits.

The automatic load following (ALF) mode of operation of the pressure regulator system is not a safety related function but is instead an operational improvement. Since it consists of non-essential equipment, the ALF mode may be disabled and no testing of the ALF mode is required for the pressure regulator system (PSE&G Safety Evaluation No. PSE-SE-2-002, Deletion of Automatic Load Following Testing from the Power Ascension Test Program, August 10, 1985, Reference 1).

Test Condition 4 is in the region of natural circulation, and current plant Technical Specifications do not allow continued operation at this condition. Since this condition is not an intended mode of operation, the testing can be deleted (GE Technical Evaluation, " Natural Circulation Operation, Delete Test Condition", Reference 2). The objectives and requirements of Regulatory Guide 1.68, paragraphs 4.u and 5.s are still satisfied with the remaining testing.

1

/ .

1 Testing of the backup pressure regulator is performed by simulating the failure of a selected pressure regulator. This test is currently planned to be performed at Test Conditions 2, 3, 5, and 6. Testing at Test Conditions 2, 3, and 6 provides adequate demonstration of the capability of the backup pressure regulator to control pressure in the event of a failure of the controlling pressure regulator.

Prior to the power ascension test program, predictions of system behavior are performed to aid in the tuning of the pressure regulator. control system. In addition to this analysis, previous test experience from similar plants provides best estimates for initial controller settings. Bench calibrations of the controllers using these best estimate settings will be performed during the preoperational phase of testing. As a result of the analysis and bench calibration of controllers, the number of test conditions required to achieve the desired system performance can be reduced.

CONCLUSION:

Since the ALF feature is being disabled, deletion of testing of the pressure regulator system..in the ALF' mode does not .af fec.t' any' safety related systems or the s'afe operation' of the' plant' and does not involve an unreviewed safety question. Testing of the pressure regulator system at Test Condition 4 is not required since the plant will not normally operate in this mode and plant Technical Specifications.do not allow continued operation at natural circulation conditions. Therefore, deletion of Test Condition 4 testing does not affect any safety related systems or the safe operation of the plant and does not involve an unreviewed safety question. Testing of the backup pressure regulator at Test Conditions 2, 3, and 6 demonstrates the performance of the backup system. Deleting testing of the backup pressure regulator at Test Condition 5 does not affect any safety systems or the safe operation of the plant and therefore does not involve an unreviewed safety question. Test Number 20, Pressure Regulator, can therefore be simplified by deleting the automatic load following testing at Test Conditions 3 and 6, by deleting the backup pressure regulator testing at Test Condition 5 and by deleting testing at Test Condition 4.

REFERENCES

1. Letter, R. L. Mittl (PSE&G) to W. Butler (NRC), " Power Ascension Program Changes Hope Creek Generating Station Docket No. 50-354", August 21, 1985

2. Letter, J. C. Larrew (GE) to R. Salvesen (PSE&G), Hope Creek Project Startup Test Reduction Program", GP-85-190, September 3, 1985 2

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