ML20041C115
| ML20041C115 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 02/22/1982 |
| From: | James Shea Office of Nuclear Reactor Regulation |
| To: | Counsil W NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| TASK-04-03, TASK-4-3, TASK-RR IEB-80-07, IEB-80-7, LSO5-82-02-098, LSO5-82-2-98, NUDOCS 8202260221 | |
| Download: ML20041C115 (4) | |
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e February 22, 1982 Docket No. 50-245 s
LS05-82-02-098 4
CJ Ri3CEiVEO Mr. W. G. Counsil. Vice President p-pgg 2 519828=- 3 Nuclear Engineering and Operations
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Dear Mr. Counsil:
SUBJECT:
SEP TOPIC IV-3, BWR JET PUMP OPERATING INDICATIONS MILLSTONE 1 Enclosed is a copy of our fin &1 evaluation of SEP Topic IV-3, BWR Jet Pug Operating Indications" for Millstone 1.
This evaluation supersedes the one previously sent by letter dated' August 17, 1978. The evaluation concludes that Millstone 1 meets current criteria based on cogliance with IE Bulletin 80-07 per your April 29, 1980 letter.
This evaluation will be a basic input to the integrated safety assess-ment for your facility unless you identify changes needed to reflect the as-built conditions at your facility. This assessment may be revised if your facility design is changed or if NRC criteria relating to this subject are modified before the integrated assessment is completed.
Sincerely, l
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James Shea, Project Manager Operating Reactors Branch No. 5 Division of Licensing
Enclosure:
As stated g[OO cc w/enclosufe:
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Mr. W. G. Counsil CC State of Connecticut William H. Cuddy, Esquire.~
Office of Policy & Management Day, Berry & Howard Counselors at Law ATTN:.Under Secretary Energy One Constitution Plaza Division Hartford, Connecticut 06103 80 Washington Street Hartford, Connecticut 06115 Natural Resources Defense Council 91715th Street, N. W Ronald C. Haynes, Regional Washington, D. C.
20005 Admini,strator Nuclear Regulatory Commission Northeast Nuclear Energy Company Region 1 Office ATTN:
Superintendent 631 Park Avenue Millstone Plant King of Prussia, Pennsylvania 19406 P. O. Box 128 Waterford; Connecticut 06385 Mr. Richard T. Laudenat Manager, Generation Facilities Licensing Northeast Utilities Service Company P. O. Box 270 Hartford, Connecticut 06101 Resident Inspector c/o U. S. NRC P. O. Box Drawer KK Niantic, Connecticut 06357 Waterford Public Library Rope Ferry Road, Route 156 Waterford, Connecticut 06385 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 John F.'Opeka Systems Superintendent Northeast Uti.1 ties Service Company 1
P. O. Box 270 Hartford, Connecticut 06101
.U. S. Environmental Protection Agency Region I Office-ATTN: Regional Radiation Representative JFK Federal Building Boston, Massachusetts 02203
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SYSTEMATIC EVALUATION PROGRAM TOPIC IV-3 HILLSTONE 1 TOPIC:
IV-3, BWR JET PUMP OPERATING INDICATIONS I.
INTRODUCTION If a jet pump BWR operates with a degraded jet pump, it may become impossible to refloo'd the core in the. event of a LOCA. The safety objectives of this topic are to assure that the core flow can be determined and assure the ability to detect a jet pump failure for a range of crack / break sizes at various locations on the pump.
II.
REVIEW CRITERIA The plant design was reviewed with regard to General Design Criterion 35 of Appendix A to 10 CFR Part 50 as it relates to the ECCS being designed to provide an abundance of core cooling to transfer heat from the core at a rate so that fuel and clad damage will not inter-fere with continued effective core cooling and with regard to General Design Criterion 13 as it relates to instrumentation being provided to monitor systems over their anticipated ranges for normal opera-tion, anticipated operational occurrences and for accident conditions.
III.
RELATED SAFETY TOPICS SEP Topic V-10.B, " Residual Heat Removal System Reliability" ensures reliable plant shutdown capability. Topic VII-3, " Systems Required for Safe Shutdown" assures the design adequacy of systems necessary to ' achieve and maintain a safe shutdown condition.
Various section XV topics review the plant response with respect to abnormal and accident' conditions.
IV.
REVIEW GUIDELINES The plant is reviewed according to the guidance provided in Standard Review Plan (SRP) 6.3, " Emergency Core Cooling Systems" and SRP 7.5, "Information Systems Important to Safety."
V.
EVALUATION Reactor Operating Experience Newsletter 73-3, issued March 30, 1973, described three occasions where actual jet pump _ flow malfunctions' had been identified by individual jet pump flow indicators.
By letter dated September 19, 1975, Commonwealth Edison Company submitted a technical specification change request for Dresden and Quad Cities-stations.
The purpose was to eliminate license requirements for jet pump flow indication. Acceptance of the change would have resulted in deletion of established requirements for individual jet pump flow indicator. checks. The request raised a concern with the staff due to
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a history of jet pump problems such as failures of retainer bolt keepers and related components. This concern led to the developmen' af Multiplant Action Item B-28, "BWR Jet Pump Flow Indication Elimination" which
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addressed the adequacy of jet pump. instrumentation to monitor jet pump behavior.
The concerns of Action Item B-28 are identical to those of SEP Topic IV-3 regarding the ability to detect jet pump failures.
In February 1980, a jet pump holddown beam bar failed at Dresden Unit 3 and resulted in jet pump displacenent.
This event renewed interest in jet pump' component integrity and assurance of jet ' pump operational integrity.
As a result, the NRC issued IE Bulletin 80-07, "BWR Jet Pump Assembly Failure" on April 4,1980, and a Supplement dated May 13, 1980.
The Bulletin raises a concern that the holddown beam assemblies and a subsequent jet pump function may degrade significantly during operation and could lead to jet pump disassembly and possibly reduce the margin of safety during postulated accidents.
Therefore, licensees of GE designed BWR-3 and BWR-4 facilities with operating licenses were required to take actions which would assure that adequate surveillance of jet pump operability is maintained.
Northeast Utilities responded to IE Bulletin 80-07 by letter dated April 29, 1980.
The letter indicated the licensee's agreement to implement a modified jet pump' surveillance program at Millstone 1.
The specific monitoring requirements of IE Bulletin 80-07 go beyond those which were under consideration in Multi-plant Action Item B-28.
Therefore, the staff considers item B-28 as complete.
IV.
CONCLUSION Based on the above considerations, we conclude.that the. licensee's '
modified jet pump surveillance program is sufficient-to detect jet pump failure.
Therefore, we consider Topic-IV-3 to be complete.
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