ML20210H452
| ML20210H452 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 02/03/1987 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20210H426 | List: |
| References | |
| 50-443-86-54, NUDOCS 8702110428 | |
| Download: ML20210H452 (1) | |
Text
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APPENDIX A NOTICE OF DEVIATION Public Service Company of New Hampshire Docket No.
50-443 Seabrook Unit 1 License No. NPF-56 During an NRC inspection conducted on November 11, 1986 - January 2, 1987, an apparent deviation from licensee commitments was identified.
One of your design activities resulted in.as-built details which deviated from the affected system design, delineated in the Seabrook Station Final Safety Analysis Report (FSAR),
as indicated below:
The Seabrook Station FSAR, Section 9.4.1.1, provides t!.e design bases for the Control Room Complex heating, ventilation and air conditioning system.
It states that, due to the redundancy of the systems, no single active failure will cause a loss of both Control Room Complex makeup air systems.
It further states that the Control Room makeup ventilating system is capable of main-taining a positive pressure within the complex at all times and is designed to remain functional during an assumed loss of offsite power concurrent with a single active failure.
Contrary to the above, the Seabrook design for the control room makeup ven-tilating system, as implemented, provides for automatic isolation of the re-dundant makeup air trains, given a failure of one vital bus.
Thus, a positive pressure cannot be maintained automatically within the Control Room Complex, assuming this single active failure, unless manual operator actions are in-plemented outside the Control Room Complex.
The NRC safety evaluation for the Control Room makeup ventilating system (reference: NUREG-0896, section 9.4.1) documents no consideration of the need for manual action in evaluating the acceptability of this system to " automatically" maintain the Control Room within environmental limits for uninterrupted safe occupancy of manned areas during all operating modes and in the event of a single a:tive failure.
This apparent discrepancy between the actual system design and the commitments made in the Seabrook Station FSAR, and as evaluated in NUREG-0896, represent a deviation.
Public Service Company of New Hampshire is hereby requested to submit to this of-fice, within 30 days of the date of the letter transmitting this Notice, a written statement or explanation in reply, including: (1) the reason for the deviation, if admitted; (2) the corrective steps which have been taken and the results achieved; (3) the corrective steps which will be taken to avoid further deviations; and (4) the date when full compliance will be achieved. Where good cause is shown, consideration will be given to extending this response time.
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