ML19256F529
| ML19256F529 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 06/09/1976 |
| From: | Moeller D Advisory Committee on Reactor Safeguards |
| To: | Rowden M NRC COMMISSION (OCM) |
| Shared Package | |
| ML19256F505 | List: |
| References | |
| ACRS-1648, NUDOCS 7912190341 | |
| Download: ML19256F529 (3) | |
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ADVISORY COMMITTEE ON REACTOR SAFEGUARDS NUCl. EAR REGULATORY COMMISSION l'-
W ASHINGToN, D. C. 20555 JtEE 9, 1976 Honorable Marcus A. Bowden Chairman U. S. Nuclear Regulatory Comission Washington, DC 20005
SUBJECT:
REPORT ON ZION STATION UNITS 1 AND 2
Dear Mr. Bowden:
During its 194th meeting, June 3-5, 1976, the Advisory Co m ittee on Reactor Safeguards completed its review of the proposal to increase the maxiam reactor Ecwer of the Zion Station Units 1 and 2 from 2760 ist (85% of full gewer) to the rated power of 3250 MNt. We Comittee had previously discussed operation of the Zion Station, in its reports of f
August 17, 1972, May 17, 1973 and December 9, 1974. A Subcomittee meet-ing on the current proposal was held in Kenosha, Wisconsin on May 27, 1976, subseque.nt to a visit to the site on May 26, 1976. During its review, the Comittee had the benefit of discussions with representatives of Co=cn-wealth Edison Company, Westinghouse Electric Corporation, the Nuclear Regulatory Comission Staff and of the documents listed, as well as com-
'ments from members of the public.
In its previous letters relating to the Zion Station, the Comittee listed several concerns which, in its opinion, mitigated against the full power operation of these large reactors at a site having a significantly larger than average population density. 'Ihree of these cencerns, relating to fuel behavior, control of core power distribution, and reliability of diesel generator startup, have been resolved to the satisfaction of the NRC Staff, as reported in its Safety Evaluation Re prt dated May 20, 1976.
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'Ibe ACRS believes that with the resolution of these three matters it is acceptable for the Zion Station reactors to be operated at full power.
However, the Connittee believes that other matters should be dealt with in a time 17 fashion if the Zion reactors are to continue to be operated at full gewer over the lifetime of the plant. 'Ihe ACRS recotimends that these matters, as set forth below, be addressed by the Applicant and the NRC Staff during the next year:
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Honorable Marcus A. Rowden June 9, 1976 i
(1) A review of the entire Station for systems interaction that might lead to significant degradation of safety.
(2) A review of the Station with regard to differences from current criteria, and judgments concerning possible back-fitting requirements.
(3) The implementation of instrumentation to provide early information concerning the course of a full range of postulated serious accidents, and procedures for inter-preting and relating this infctmation to emergency plans.
(4)
Installiscion of a loosa-parts renitoring system as soon as practicable.
(5)
Evaluation and prompt implementation of improvements in fire protection capability, as necessary.
(6) Timely implementation of modifications required in connection with the resolution of AWS.
(7) Continued studies directed to enhancement of the capability and reliability of the Emergency Core Cooling Systems.
(8) Demonstration of the reliability of the diesel generators to operate with load for extended periods of time.
(9) Assessment of the safety significance of the large num!:er of reportable events experienced at the station, and prompt implementation of significant improvements in operational quality assurance.
(10)
Prompt implementation of improvements in industrial security as appropriate.
Other generic problems relating to large water reactors are discussed in the Comittee's report dated April 16, 1976. As solutions to these prob-le=s are found, both the Applicant and the NRC Staff should give a high priority to their prompt implementation at the Zicn Station.
The ACRS wishes'to review the status of these matters by June of 1977.
The Advisory Comittee on Reactor Safeguards believes that, if due regard is given to the items mentioned above, there -is reasonable assurance that the Zion Station Units 1 and 2 can be operated at full power, 3250 MNt, without undue risk to the health and safety of the public. As noted above
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." Eonorable Marcus A. Rowden June 9. 1976 l.
the Comittee will again review the operation of the Zion Station in a; proximately one year.
Sincerely yours, 9,AE 6 Dade W. Moeller Chairman REFERECES 1.
Safety Evaluation Report on Zion Station, Units 1 and 2, dated May 20, 1976.
2.
Supplement No.1 to the Startup Test Report Issued November 1974 on Zion Nuclear Power Station, Unit 1, dated April 16, 1976.
3.
Iatter from E. Jenkins to ACRS concerning full power cperation of the Zion Station, dated Jtr e 1976.
4.
Iatter from D. Comey to E.G. Case, concerning reliability of emergency diesel generators at Zion Stations, dated August 28, 1974.
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