ML20058G013
| ML20058G013 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 06/22/1982 |
| From: | Overbeck G, Vosbury F Franklin Research Ctr, Franklin Institute |
| To: | Chow E Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20058G003 | List: |
| References | |
| CON-NRC-03-81-130, CON-NRC-3-81-130, RTR-NUREG-0737, RTR-NUREG-737, TASK-2.K.3.17, TASK-TM NUDOCS 8208030169 | |
| Download: ML20058G013 (5) | |
Text
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Enclesyra,
REQUEST FOR ADDITIONAL INFORMATION' ECCS REPORTS (F-47)
TMI ACTION PLAN REQUIREMENTS YANKEE ATOMIC ELECTRIC COMPANY YANKEE R0WE NUCLEAR POWER PLANT NRC DOCKET NO.50-029 FRC PROJECT C5506 FRC ASSIGNMENT 7 NRC CONTRACT NO. NRC43-81-130 FRC TASK 303 Preparedby Franklin Research Center Author: F. Vosbury 20th and Race Street Philadelphia, PA 19103 FRC Group Leader: G. Overbeck Prepared for Nuclear Regulatory Commission Lead NRC Engineer:
E. Chow Washington, D.C. 20555 t
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ek TER-CS506-303 INTRODUCTION l
This Request for Additional Informt tion (RAI) is the result of an evalua-tion of the information contained in the Yankee Atomic Electric Company's (YAEC) letter dated January 1,1981 [1] to the Nuclear Regulatory Commission (NRC) in response to NUREG-0737 (2], Item II.K.3.17, " Report on Outages'of Emergency Core-Cooling Systems Licensee Report and Proposed Technical Specification Changes." The evaluation revealed an item of concern.
Additional information relating to this concern is needed before a final cvaluation can be made.
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TER-C5506-303 Item II.K.3.17 Report on Outages of Emergency Core Cooling Systems Licensee Report and Proposed Technical Specification Changes BACKGROUND In NUREG-0737, Item II.K.3.17, the NRC requested that a licensee submit a esport detailing dates, lengths, and causes of outages for all emergency core cooling (ECC) systems for the last five years of operation.
The purpose of
' die request was to obtain a quantitative history of the unavailability of the ECC systems to help the NRC determine if cumulative outage limitations are required in technical specifications.
To clarify the issue, the report was to contain the following details on outages that occurred during a continuous 5-year period of recent operation:
(1) dates and durations; (2) causes, including test and maintenance; (3) ECC systems or components involved; and (4) corrective actions taken.
In addition, a licensee was to propose changes to improve the availability of ECC system equipment, if necessary.
CONCERN Evaluation of calculated small-break transients, with the assumptions of proper operator actions and the worst single failure in the ECC systems, has shown that some small breaks will result in partial uncovering of the core.
However, tecs.aical specifications permit several components of the ECC systems to have substantial outage times.
In addition, there are no cumulative outage limitations for ECC systems. Thus, the unavailability of an ECC system train for extenced periods is not precluded.
For an evaluation of the responses to NUREG-0737, Item II.K.3.17, to be msaningful and to produce significant conclusions, the responses must be complete and accurate. They must include, for a continuous 5-year period of recent operation, not only the outage dates, durations, and causes, ECC system equipment involved, and corrective actions taken, but also outages of the diesel generators and identification of the ECC system trains affected by the outages. Outages for surveillance testing and for planned, unplanned, and a Udd Franklin Research Center
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i TER-C5506-303 preventive maintenance should also be reported.
This information will be used to determine the cumulative outage time of each ECC system train per reactor year and the need for cumulative outage limitations in the technical specifications.
YAEC's response [1] does not appear to include test, scheduled preventive maintenance, or lesser planned maintenance outages which contributed to cumulative ECC system unavailability.
The YAEC response does not provide sufficient information to satisfy the objective of NUREG-0737, Item II.K.3.17.
REQUEST In order for the staff to continue its review of YAEC's response to NUREG-0737, Item II.K.3.17, additional information is required:
A complete summary of outages for surveillance testing and planned, unplanned, or preventive maintenance in the ECC and diesel generator systems for the a continuous 5-year ' period of recent operation.
For each outage, include the date, duration, and cause, the ECC or diesel generator system, train, and component involved.
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TER-C5506-303 REFERENCES l.
J. A. Kay (YAEC)
Ietter to D. G. Eisenhut (NRR)
Subject:
Post-TMI Requirements, Implementation of NUREG-0737 January 1, 1981 2.
" Clarification of 'IMI Action Plan Requirements" NRC November 1980 4
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