05000029/LER-1986-014, Forwards LER-86-014-00

Forwards LER-86-014-00

ML20212A844
Person / Time
Site:	Yankee Rowe
Issue date:	11/28/1986
From:	St Laurent N YANKEE ATOMIC ELECTRIC CO.
To:	Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
NUDOCS 8612290057
Download: ML20212A844 (1)

LER-2086-014, Forwards LER-86-014-00

Event date:
Report date:
0292086014R00 - NRC Website

text

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YANKEE ATOMIC ELECTRIC COMPANY r.i.vu on.<<,,,<2<.s2e, Star Route, Rowe, Massachusetts 01367

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November 28, 1986 U.S. Nuclear Regulatory Commission Region I 631 Pa-k Avenue Ung of Prussia, Pennsylvania 19406 Attention: Dr. Thomas E. Murley, Regional Administrator

Subject:

Licensee Event Report 50-29/86-14 Plant Shutdown Due to Loss of Pressurizer Wide Range Level Channel (PR-L-8)

Dear Sir:

In accordance with 10 CFR 50.73(a)(2)(i), the attached Licensee Event Report is hereby submitted.

Very truly yours, klstek f/

Normand N. St. Laurent LRO Plant Superintendent DAR/nm Enclosure cc: [3] NSARC Chairman (YAEC)

[1] Institute of Nuclear Power Operations (INPO) 8612290057 861128 PDR ADOCK 05000029 S PDR

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U.S. NUCLE A 4 REGULATORY COneMIS$3ON es#C Ferat 306

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LICENSEE EVENT REPORT (LER)

DOCKET NUMSER 12) PAGE 43)

PACILITV NAast (11 Yankee Nuclear Power Station, Rowe, Massachusetts ol5l010l0l0l2l9 i jopl 0; 1 Ta1LE tel Plant Shutdown Due to Loss of Pressurizer Wide Range Level Channel (PR-L-8)

EVENT DATE ISI LER NUMSER (61 REPORT DATE (71 OTHER F ACILITIES INVOLVED 101 DOCnET NUMgERiss MONTM OAv Y E Ae* YEAR ,0,947, [*f,8y MONTH DAY VEAR F ACILIT v Nawts ol5l0l0lo1 l l 1l0 3l 1 8 6 8 l6 0l1l4 0j 0 1l1 2l8 8l6 o iss oio,oi l l Tws REPORT is susMiTTED PURSUANT To THE REOuiREMENTs Or 10 Can 6. tea.ca eae er

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• co" Donald A. Rice, Plant Engineer 4 i ll3 4l2 4; i i 5; 21 6l 1 COMPLETE ONE LINE FOR E ACM COMPONENT P AILURE DESCRISEO IN THis REPORT 1131 REPO iA MAN AC rep "LE CAust SYSTEM COMPON E NT *

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B JC LT R3 69 N I I I I I I I I I I I I 1 I I l I l l l I I i i i I I f SUPPLEMENT AL REPORT EmpECTED (141 MONTM DAY VEAR

$V O M' 55lON 4Es (19 von temerete LJtPECTfD Suthtt$$10N CA rtJ %Q l l l AttTR ACT flunar se f 400 spores # e . epareseere,y Mreen sme.e spece ryneerersen # mess 1163 On 10/31/86, with the plant in Mode 1 at 100% power, it was determined that the Main Coolant System pressurizer wide range level channel (PR-L-8) was not responding accurately to changes of pressurizer level. In addition to pressurizer level indication, the channel provides high and low level alarm and pressurizer high level reactor scram. The plant entered Tect nical Specification 3.3.1, Action Statement 8 at 0915 hrs, 10/31/86, and the channel was declared inoperable. The transmitter was found to be faulty, and since it could not be replaced within the six-hour time frame allowed by TS 3.3.1 Action Statement 8, an orderly plant shutdown was initiated. The NRC was notified via ENS at 1150 hrs on 10/31/86. The plant was placed in Mode 3 at 1423 hrs. Although the pressurizer high level scram function was lost when the channel was declared inoperable, the main coolant high pressure scram circuit was operable and provided reactor scram protection. All automatic safety systems except pressurizer high level reactor scram were available during the event. The root cause of the event has been attributed to a faulty sensor module in a Rosemount level transmitter (Model 1153HB5PA). The transmitter was replaced in kind and the plant was returned to Mode 1 at 1007 hrs, 11/1/86.

The failure of this transmitter will be evaluated to determine if it is reportable pursuant to 10 CFR Part 21. A supplemental report will follow this LER if a Part 21 report is deemed necessary. This is the first occurrence of this nature. There was no adverse effect on the health and safety of the public s as a result of this event.

OdVUS

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