ML17199F675
| ML17199F675 | |
| Person / Time | |
|---|---|
| Site: | Dresden, Peach Bottom, Brunswick, 05000000 |
| Issue date: | 01/21/1986 |
| From: | Hebdon F NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Vollmer R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| Shared Package | |
| ML17199F676 | List: |
| References | |
| AEOD-E601, NUDOCS 8603120084 | |
| Download: ML17199F675 (2) | |
Text
..... * --.-
~
MEMORANDUM FOR:
FROM:
SUBJECT:
JAN 21 1986 Richard H. Vollmer, Deputy Director Office of Inspection and Enforcement Frederick J. Hebdon, Deputy Director Office for Analysis and Evaluation of Operational Data DEFICIENT OPERATOR ACTIONS FOLLOWING DUAL FUNCTION VALVE FAILURES AEOD/E601 Enclosed is an AEOD engineering evaluation report concerning several recent events involving deficient operator actions following the failure of a dual function (i.e., emergency core cooling system/containment isolation) valve.
The report evaluated events involving dual function valve failures at Dresden-3, Brunswick Units 1 and 2 and Peach Bottom-3.
From our review of the operational experience, we found that the proper and conservative operator actions taken in response to a dual function valve failure have not always been fully consistent with the plant's technical specifications.
In each event, the operator's actions taken to preserve one function of a dual function valve disabled the valve's alternate function.
Furthermore, the operator's actions were taken without declaring the adversely affected function of the valve to be inoperable as required by the plant technical specifications. At Dresden-3, the affected ECCS loop operability was preserved, but containment isolation capability was disabled.
At Brunswick and Peach Bottom-3, containment integrity was maintained, but the affected safeguard trains were disabled.
From our investigation, we found an NRC staff document (prepared by NRR) which describes the appropriate actions to be taken following the failure of a dual function valve.
The document, which is attached to the enclosed report, was developed in connection with the Dresden event, and contains generic guidance applicable for all licensees. However, it is our understanding that this guidance has not been transmitted to any licensee other than Commonwealth Edison (for Dresden).
It is suggested that the Office of Inspection and Enforcement consider issuing an information notice which discusses the recent events involving dual function valves and provides the NRC staff guidance concerning appropriate actions to be taken following the failure of a dual function valve.
. [
8603120084 860121... '!
.PPR ADDCK ()500024~.*
's p~ \\_)
Richard We also found that although the dual function valves involved in these events are listed in the respective plant's FSAR as containment isolation valves, they are not included in the plant technical specifications. Because the valves are not typically included in the plant technical specifications, the associated action statement may not always be fully apparent to the operating personnel involved.
Therefore, by separate memorandum, we have requested that the Office of Nuclear Reactor Regulation consider requiring each licensee to list and identify all dual function valves in the table of containment isolation valves of each plant's technical specifications.
If you or your staff have any questions concerning the enclosed engineering evaluation report, please contact Eric Leeds of my staff on extention 24445.
Enclosures:
As stated cc: w/enclosure E. Jordan, IE R. Baer, IE T. Johnson, RI B. Roland, RII T. Tongue, RI II Distribution
,*_ l?[:)R- : ~-,
AEODCF ROAB CF Eleeds SRubin KSeyfrit F.Hebdon Odllnal Sillsed By frederick f Hebrfo" Frederick J. Hebdon, Deputy Director Office for Analysis and Evaluation of Operational Data
~~=-- ~ ~~~~: ~=~~~~ -
~ =~~~~V(
H
~ ~~~=~~-----:------------ ~ ------------: _______ ----
NAME :Ele s:as
- SRubin
- KSeyfrit
- FHebdon DATE ~lf~~a6-----~If16fa6-----~lfJkfB6-----~lf;~fB6-----:------------:------------:-----------
0FFIC1AL RECORD COPY