NRC-92-0068, Confirms Util Commitment on Procedure to Ensure That Each Containment Isolation Valve Will Be in Appropriate Position During SBO Event & Provides Schedule for Final Implementation of Procedure
| ML20096G767 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 05/20/1992 |
| From: | Orser W DETROIT EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-92-0068, CON-NRC-92-68 NUDOCS 9205260260 | |
| Download: ML20096G767 (2) | |
Text
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ww.m s. or..r Senior Wee President Yr Detroit 6400 teorth Dme Mg%nat EdIOvl I lOOM P4ewpcrt. Michigan 481(4 NUCleaf p oo sessni opretion.
May 20, 1992 NRC-92-0068 U. S. Nuclear Regulatory Commission Attn Document Control Desk Washington, D.C.
20555
References:
- 1) Fermi 2 NRC Docket No. 50-341 NRC License No. NPF-43
- 2) NRC Letter, " Fermi-2 Conf ormance to Station Blackout Rule 10CFR50.63 (TAC No. 68545)", dated June 12, 1991.
- 3) Detroit Edison Letter, NRC-91-0086, " Station Blackout Rule Implementation", d6ted July 17, 1991.
- 4) Detroit Edison Letter. NRC-92-0017. " Completion of Station Blackout Rule Implementation", dated Februa ry 21, 1992.
- 5) NRC Letter, " Fermi Supplemental Safety Evaluation
- Response to Station Blackout Rule (TAC No.
M81254)", dated _ April 9,1992.
- 6) NUMARC 87-00, Revision 1, " Guidelines and Technical Baser for NUMARC Initiatives Addressing Station Blackout at Light tater Reactors", dated August 1991.
Subject:
Confirmation Response to NRC Supplemental Safety Evaluation on Fermi 2 Inplementation of Station Blackout Rule- (10CFR50.63)
By the Reference 2 letter, the NRC staf f' forwarded to Detroit Edison l
its initial Safety Evaluation (SE) of Fermi 2's conformance to the Station Blackout (SBO) Rule, i.e., 10CFR50.63. Detroit Edison responded to the NRC staf f's recommendations contained in the SE via References 3 and 4.
By the Reference 5 letter, the NRC found the Fermi 2 responses acceptable and provided the staf f's Supplemental Safety Evaluation (SSE). The SSE completes the NRC staf f's review and closure of Fermi 2's conformance to the SB0 Rule. However, the staf f requested that Detroit Edison confirm "that a procedure is established to ensure that each containment isolation valve will be in its appropriate position during an SB0 cvent" by stating our commitment l
and schedule for establishing that procedure. The purpose of this bIbO f} C 7 (2][27 9205260260 920520 PDR ADOCK 05000341
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May 20, 1992 NRC-92-0068 Page 2 letter is to confirm Detroit Edison's commitreat on this procedure and provide a schedule for its final implementation.
As discussed in the NRC's SSE (section 2.6. " Containment Isolation"),
Detroit Edison has indicated that valves necessary for containment isolation or which must be operated (cycled) during a four-hour SB0 event can be positioned (with indication) independent of the preferred and blacked out unit Class 1E emergency power supply. Means of closure include manual operation, DC-powered supply, alternate AC powered operation and air-operated valves that f ail closed on loss of air.
Valve position can be determined by either control panel indicating lights or by mechanical valve position indicators at the valve. This position, as 'oted by the NRC in the Reference 5 SSE, is consistent with the Reference 6 NUMARC 87-00, Revision 1, guidelines.
This position satisfied the NRC staf f's technical concerns on containment isolation valves.
Regarding the procedure requested by the NRC in Reference 5. Detroit Edison currently has procedural guidance in this area.
In light of the NRC staf f's specific request and based oa a followup teleconference with Mr. Timothy Colburn of your staf f Detroit Edison is reviewing current procedural guidance.
Based on the results of this review, the Fermi 2 procedure (s) af fected will be revised, as needed, to fulfill the requested commitment regarding ensuring containment isolation valve appropriate positions during an SB0 event. This review and any revision (s) to af fected Fermi 2 procedure (s) will be completed by July 31, 1992. Thi. schedule is provided per 10CFR50.63(c) (4).
Mr. Colburn. ill be notified verbally when this action has been fully implemented.
De t roit Edison reconfirms that all required SB0 evaluation documentation is available onsite for review at your discretion.
Det roit Edison is maintaining the SB0 analysea and related information (e.g., the documentation supporting previous SB0 submittals to the NRC) for any future NRC inspections and/or conf ormance audits in this
-area.
If there are any questiens regarding this matter, please contact Mr.
Ter ry L. Riley, Supervisor, Nuclear Licensing, Regulatory Af f airs, at (313) 586-1684.
Since rely.
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cc:
T. G. Colburn A. B. Davis M. Phillips S. Stasek
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