ML19337B647
| ML19337B647 | |
| Person / Time | |
|---|---|
| Site: | Cooper  |
| Issue date: | 09/24/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Pilant J NEBRASKA PUBLIC POWER DISTRICT |
| References | |
| TAC-08938, TAC-8938, NUDOCS 8010080390 | |
| Download: ML19337B647 (3) | |
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UNITED STATES y
g NUCLEAR REGULATORY COMMISSION
- E WASHINGTON, D. C. 20555
% "' Ql SEPTEniBER 2 41900 Docket No. 50-298 Mr. J. M. Pilant, Director Licensing & Quality Assurance Nebraska Public Power District P. O. Box 499 Columbus, Nebraska 68601
Dear Mr. Pilant:
By our letter dated August 7,1978, we informed you of deficiencies we identified in the design of the Hatch 2 regulator system for the motor generator (M-G) sets which supply power to the reactor protection system (RPS).
In general, the problem involved the possibility of the M-G producing power which was of a quality (High/ low outage, etc.)
that could be outside that for which the RPS has been demonstrated to be acceptable.
Specifically, the deficiencies involved:
(1) Potential sequence of undetected single component failures which could adversely affect the operability of the RPS; and (2) Postulated component malfunctions initiated by a seismic event which could adversely affect the operability of the RPS.
Our letter requested that you review your RPS pcwer supply to determine if your system was susceptible to the same adverse possibilities that the staff had identified for Hatch 2.
We have completed our review of your response to our request and have determined that the power supply RPS design at your facility is such that it could experience the same adverse conditions as described above Accordingly, we have determined that m^Jifications should be performed to provide fully redundant Class lE protection at the interface of the non-Class lE power supplies and the RPS. We believe that the use of alarms or shift surveillance is acceptable as an interim measure but is not adequate for the long-term solution of our concerns.
tie have found that the conceptual design proposed by the General Electric Cem;:any and the installed modification on Hatch 1 are acceptable solutions to our concern.
8010 080 @ O j
Mr. J. M. Pilant In view of the above, we believe that you should modify the power supply for the RPS at yaur facility. This modification should be implemented by the end si the next refueling outage.
Should this scheduled outage occur within the next six months, the modifica*. ions should be accomplished by the end of the subsequent refueling outage.
We will perform a post-inplementation revise of your nodification and till require appropriate Technical Specifications for the system.
We request that you provide within 60 days of your receipt of this letter: your (1) commitment to install a Class lE system, (2) schedule for completion of the modification and (3) schedule for submission of design information and proposed Technical Specifications.
Sincerely, ThomavW. Ippolito, Chief Operating Reactors Branch #2 Division of Licensing cc:
See next page i
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Mr. J. M. Pilant Nebraska Public Power District.
cc:
I Mr. G. D. Watson, General Counsel Nebraska Public Power District P. 0. Bor 499 Columbus, Nebraska 68601 l
Mr. Arthur C. Gehr, Attorney s
Snell & Wilmer 3100 Valley Center Phoenix, Arizona 85073 Cooper Nuclear Station ATTN:
Mr. L. Lessor Station Superintendent l
P. O. Box 98 l
Brownville, Nebraska 68321 l
A iburn Public Library j
.3 - 15th Street 4
Auburn, Nebraska 68305 I
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