ML20210B464

Discusses Review of Control Room Staff Emergency Operating Procedures During 860712 Trip.Actions & Instructions in Diagnostic Flow Chart Associated W/Tripping Reactor Coolant Pumps Inconsistent W/Approved CEN-152

ML20210B464
Person / Time
Site:	Palo Verde
Issue date:	09/10/1986
From:	Knighton G Office of Nuclear Reactor Regulation
To:	Chaffee A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
Shared Package
ML20210B467	List: ML20210B464 ML20210B528 ML20210B549
References
NUDOCS 8609180087
Download: ML20210B464 (1)

Text

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, SE C.m1986

. Dock'et No.: 50-528 MEMORANDUM FOR: Alfred Chafee, Deputy Director Division of Reactor Safety and Projects, Region V FROM: George W. Knighton,. Director Project Directorate No. 7-Division of PWR Licensing-B

SUBJECT:

REVIEW 0F PALO VERDE PROCEDURES AS RELATED TO THE JULY 12TH TRIP AT PALO VERDE UNIT 1 In response to questions raised by R. Zimmerman, Senior Resident Inspector at Palo Verde Nuclear Generating Station, NRR staff members have conducted a -

review of actions taken by the Palo Verde control room staff in dealing with an event that took place at Palo Verde Unit 1 on July 12, 1986. This review involved an analysis of the Palo Verde Emergency Operating Procedures, a comparison of those guidelines (CEN-152) , an procedures with examination of the the Combustion Engineering post-trip review Procedures of the event, and the evaluation of operator actions as the reviewers understood them following discussions with plant staff and the senior resident inspector. The results of this evaluation are enclosed.

One of these findings is that the licensee procedures program did not appear to meet commitments established during the licensing process. These "devia-tions" are related to the E0P's and crew response to the July 12, 1986 event as identified in Section 1., page 2 & 3 of the staff evaluation. Furthermore, actions and instructions in the Diagnostic Flow Chart associated with tripping the reactor coolant pumps appear to be inconsistent with the current approved version of CEN-152 and with the plant's written procedures. In addition, the use of parameter trending as indicated in CEN-152 to assist in event diagnosis

.does not appear to be effectively incorporated into the Diagnostic Flow Chart, as indicated in Section 2 of the evaluation.

The reviewers have offered a number of recommendations for addressing the issues identified. These recommendations suggest the need for a more reliable power source for instrumentation displaying the parameters necessary for event diagnosis (Section 3), and revisions to the Diaonostic Flow Chart to ensure that the Functional Recovery Procedures are used when necessary. The recom-mendations are provided for your consideration.

8609180087 860910 George W. Knighton, Director PDR ADOCK 05000528 PWR Project Directorate No. 7 s P DR -

Division of PWR Licensing-B

Enclosure:

As stated

Contact:

J. Raleigh Distribution:

X24679 Docket File PD7 Reading NRC PDR J. Raleigh

. Local PDR J. Lee

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