View source for 05000267/LER-1980-065-03, /03X-1:on 801105,reactor Operated in Degraded Mode.Caused by Removal of Snubbers for Verification of Bleed Rate.Snubbers Were Adjusted & Replaced

{{Adams
| number = ML19340E474
| issue date = 01/09/1981
| title = /03X-1:on 801105,reactor Operated in Degraded Mode.Caused by Removal of Snubbers for Verification of Bleed Rate.Snubbers Were Adjusted & Replaced
| author name = Gahm J
| author affiliation = PUBLIC SERVICE CO. OF COLORADO
| addressee name = 
| addressee affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION IV)
| docket = 05000267
| license number = 
| contact person = 
| document report number = LER-80-065-03X, LER-80-65-3X, NUDOCS 8101140630
| package number = ML19340E473
| document type = LICENSEE EVENT REPORT (SEE ALSO AO RO), TEXT-SAFETY REPORT
| page count = 4
}}
{{LER
| Title = /03X-1:on 801105,reactor Operated in Degraded Mode.Caused by Removal of Snubbers for Verification of Bleed Rate.Snubbers Were Adjusted & Replaced
| Plant = 
| Reporting criterion = 
| Power level = 
| Mode = 
| Docket = 05000267
| LER year = 1980
| LER number = 65
| LER revision = 3
| Event date = 
| Report date = 
| ENS = 
| abstract = 
}}

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*E*CRT O ATE is0 EVENT DESCRIPTION AND PROS A8LE CONSEQUENCES h l3!2l lDuring nor=al operation, while verifying hydraulic snubber bleed rate, five Class 1 l
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There was no ef f ec t on the health or safety of the public.
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u REPORT DATE:
Januarv 6, 1981 REPORTABLE OCCURRENCE 80-65 ISSUE 1 OCCURRENCE DATE:
November 9, 1980 Page 1 of 3 FORT ST. VRAIN NUCLEAR GENERATIm STATION PUBLIC SERVICE COMPANY OF COLORADO 16805 WELD COUNTY ROAD 191/2 PLATTEVILLE, COLORADO 80651 REPORT NO. 50-267 /80-65 /03-X-1 Revised Final IDENTIFICATION OF OCCURRENCE:
During November,1980, five Class I hydraulic shock suppressors were removed from service, one at a time, for test. Each event constitutes operation in a degraded mode allowed by LCO 4.3.10 and is reportable per Fort St. Vrain Technical Specification AC 7.5.2(b)2.
EVENT

==DESCRIPTION==
On five occasions, while the reactor was at power, operable Class 1 shock suppressors (snubbers) were removed from service for test:
VSS-110 - out of service from 0845 hours to 1235 hours on November 5, 1980 VSS-101 - out of service from 1305 hours on November 5,1980, to 0950 hours on November 6,1980 VSS-104 - out of service from 1007 hours to 1100 hours on November 6, 1980 VSS-111 - out of service from 1325 hours on November 6,1980, to 1745 hours on November 7,1980 Technical Specificaciou LCO 4.3.10 states that all shock suppressors on i
Class 1 piping systems shall be operable if the reactor is not shutdown or refueling. The LCO further statas that continued power operation af ter a snubber is determined to be inoperable is permissible only during the suc-ceeding 72 hours unless the snubber is made operable sooner or replaced.
The five vent stack snubbers removed for test were returned to service with-l in the allowed 72 hours in all cases.
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REPORTABLE OCCURRENCE 80-65 ISSUE 1 Page 2 of 3

==CAUSE==
DESCRIPTION:
During performance of the hydraulic snubber functional test required each refueling by the Fort St. Vrain Technical Specifications, it was found that the 16 vent stack snubbers did not have bleed capability. This was reported as part of Reportable Occurrence 79-13.
The 16 non-bleeding hydraulic snubbers were modified or replaced so that bleed capability was available.
During the evaluation of seismic restraints in accordance with I & E Bul-letin 79-14, it was determined that the bleed rate on these 16 snubbers shou'.d be zero.
The blsed rate of the 16 vent stack snubbers was adjusted to zero with the snt.bbers in place. In order to verify that the bleed rate is in f act zero, each snubber is being removed, cesced, and replaced. During November, 1980, five snubbers were removed from service for test, resulting in five events of operation in a degraded mode allowed by LCO 4.3.10.
CORRECTIVE ACTION:
Each of the five snubbers were returned to service af ter testing was com-ple ted.
No further corrective action is anticipated or required for the f ;ve vent stack snubbers noted in this report.
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REPORTABLE OCCURRENCE 80-65 ISSUE 1 Page 3 of 3 Prepared By:
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Richard R. Frost Technical Services Technician Reviewed By:
c-Tec a Services Supervisor Reviewed By:
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Frank M. Mathie Operations Manager Approved By:
W,o M Don Warembourg
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Manager, Nuclear Production
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