DCL-86-355, Special Rept 86-03:on 861202,plant Vent high-range Monitor Failed in high-range.Replacement Detector Ordered & Scheduled to Arrive on 870108

Special Rept 86-03:on 861202,plant Vent high-range Monitor Failed in high-range.Replacement Detector Ordered & Scheduled to Arrive on 870108

ML20215G026
Person / Time
Site:	Diablo Canyon
Issue date:	12/15/1986
From:	Shiffer J PACIFIC GAS & ELECTRIC CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
86-03, DCL-86-355, NUDOCS 8612240205
Download: ML20215G026 (2)

Text

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RECEIVED PACIFIC GAS AND E LE C T RIC bbMPANY 1%b bEC lb A 4 bbWb ' l 77 BEALE STREET . SAN FRANCISCO, CALIFORNIA 94106

• 10: 2 0 372-6587 (415)781 4211 . TM 91 REGION V JAMES D. SHIFFER F vitt pee 51 DENT f HUCLEAR POWER GENERAftON December 15, 1986 PGandE Letter No.: DCL-86-355 i

Mr. John B. Martin, Regional Administrator U. S. Nuclear Regulatory Commission, Region V '

1450 Maria Lane, Suite 210 Halnut Creek, CA 94596-5368 Re: Docket No. 50-323, OL-DPR-82

> Diablo Canyon Unit 2 Special Report on Inoperability of Plant Vent High Range Radiation Monitor, SR 86-03

Dear Mr. Martin:

In accordance with the requirements of the Diablo Canyon Technical Specifications 6.9.2 and 3.3.3.6 Action d., this Special Report is being submitted concerning the Unit 2 plant vent high range radiation monitor (RM-29) being inoperable greater than 7 days.

On December 2, 1986, during the performance of Surveillance Test Procedure (STP) I-18BB2D, " Calibration of RM-29 Plant Vent High Range Monitor," RM-29 "

failed in the high range. In accordance with STP G-16 " Alternate Methods of

. Monitoring for High Range Accident Radiation Monitors," and Technical Specification 3.3.3.6 Action d., alternate methods of monitoring for high-range postaccident radiation were established at the plant vent within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> on December 5, 1986.

i A replacement detector assembly had been previously ordered and is scheduled to arrive on January 8, 1987. This order is presently being expedited. Upon ,

a receipt of the new detector, it will be calibrated and RM-29 returned to

• l operable status.

! Since alternate methods of monitoring were established in accordance with Technical Specification 3.3.3.6, no safety consequences or implications have resulted from this event.

86122 23

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..>k. J. B. Martin PGandE Letter No. DCL-86-355 December 15, 1986 Page 2 Kindly acknowledge receipt of this material on the enclosed copy of this letter and return it in the enclosed addressed envelope.

Sincerely, r

i ' /,,, t-s.

cc: L. J. Chandler M. M. Mendonca B. Norton H. E. Schierling S. A. Varga CPUC Diablo Distribution Document Control Desk 1232S/0048K/RHM/ll28 i

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