05000302/LER-1977-159-03, /03L-0:on 771228,reactor Bldg Purge Exhaust Valve AHV-1B Did Not Auto Close Upon Reactor Bldg Purge Initiation.Caused by Purge Exhaust Valve AHV-1B Not Being Open Enough to Activate Automatic Closure Matrix
| ML19308D374 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 01/17/1978 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| Shared Package | |
| ML19308D366 | List: |
| References | |
| LER-77-159-03L, LER-77-159-3L, NUDOCS 8002270825 | |
| Download: ML19308D374 (2) | |
| Event date: | |
|---|---|
| Report date: | |
| 3021977159R03 - NRC Website | |
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, exhaust valve ARV-1A operated as designed.
First occurrence of this event.,
,With valves AHV-1A,1C, & 1D closed, valve ARV-1B was openad, auto closed Iot,IIand closure was timed. The valve operated as desinned and closure time I
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,,,,,g Upon initiation of RB purge, exhaust valve ARV-1B had been opened J
,slightly when RM-Al high alarmed. The "open" limit switch had not been
, activated and the auto closure matrix had not been completed. When the high,
alarm from RM-Al was received, auto closure was not effected. A Request.
, for Engineering Information has been submitted to evaluate this occurrence.,
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SUPPL 2 MEN 1*AIG INFORMATION 1.
Report No.:
50-302/77-159 /03L-0 2.
Facility:
Crystal River Unit #3 3.
Report Date:
17 January 1978 4.
Occurrence Date:
28 December 1977 5.
Identification of Occurrence:
Containment isolation valve ARV-1B failed to close upon RM-Al high radiation alarm contrary to Technical Specification 3.6.3.1, Table 3.6-1.
t 6.
Conditions Prior to Occurrence:
Mode 1 power operation.
7.
Description of Occurrence:
(
At 1745, a Reactor Building purge was initiated.
Reactor Building purge monitor 5
RM-Al alar:ned high and the containment purge exhaust valve AHV-13 did not close.
The valve was closed by using the control switch on the ES control panel.
Redundant valve AHV-1A operated as designed. Investigation revealed that valve AHV-13 had been opened slightly when initiating the purge and had not activated its open limitsvitch.
The closure matrix was not complete and when RM-Al high alarmed the closure of AHV-13 was not effected. With purge supply valves AHV-lc and AHV-lD closed and purge exhaust valve AHV-1A closed, valve AHV-13 was fully opened. The valve was closed by iniciating a high alarm on EM-A1.
The closure was timed and the results of closing and timing were satisfactory and the valve was restored operable.
S.
Designation of Apparent Cause:
The cause of this event was due to purge exhaust valve AHV-13 not being opeo enough i
to activate its automatic closure matrix.
l 9.
Analysis of Occurrence:
There was no safety hazard to the plant or general public as redundant purge exhaust valve AHV-1A was operable and closed as designed.
10.
Corrective Action
A request for Engineering Information (REI) has been submitted to investigate and evaluate this occurrence and to recommend action to ensure auto closure of valve upon receiving a high radiatica alarm from RM-A6.
11.
Failure Data:
This is the first occurrence of this event.
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