Discusses Model 3RE-7870 Not Being Declared Operable Due to Lack of Process Flow.Monitor Failed on 900708.Caused by Moisture Intrusion Into Housing.All Affected Components Repaired or Replaced
05000361/LER-1999-004, Forwards LER 99-004-00 Re Automatic Tgis Actuation.Event Affected Units 2 & 3 Equally Because Tgis Is Shared Sys. Single Rept Is Being Provided for Unit 2 IAW NUREG-1022, Rev 1.No New Commitments Are Contained in Encl
ML20210N090
ML20210N505
ML20210P622
ML20210N972
ML20210P571
ML20210P468
ML13316A355
ML20210Q645
ML20211A950
ML13319B145
ML20210R668
ML20210V427
ML13319B146
ML20211H856
ML20211J582
ML13316A358
ML20211J715
ML20211H332
05000206/LER-1999-001, Forwards LER 99-001-00 for Occurrence Re Unattended Security Weapon Inside Protected Area.Single Rept for Unit 1 Is Being Submitted,Iaw NUREG-1022,Rev 1,since Condition Involves Shared Sys & Is Applicable to Units 1,2 & 3
ML20211N026
ML20211K419
ML13316A359
ML20217B901
ML20216E603
ML13316A361
ML20212A406
ML20212D992
05000361/LER-1999-005, Forwards 30-day follow-up LER 99-005-00,describing Loss of Physical Train Separation in Control Room.Any Actions Listed Intended to Ensure Continued Compliance with Existing Commitments
05000361/LER-1999-004, Forwards LER 99-004-00 Re Automatic Tgis Actuation.Event Affected Units 2 & 3 Equally Because Tgis Is Shared Sys. Single Rept Is Being Provided for Unit 2 IAW NUREG-1022, Rev 1.No New Commitments Are Contained in Encl
ML20210N505
ML20210P622
ML20210P468
ML20210P571
ML13316A355
ML20210Q645
ML13319B145
ML20210R668
ML20210V427
ML13316A358
05000206/LER-1999-001, Forwards LER 99-001-00 for Occurrence Re Unattended Security Weapon Inside Protected Area.Single Rept for Unit 1 Is Being Submitted,Iaw NUREG-1022,Rev 1,since Condition Involves Shared Sys & Is Applicable to Units 1,2 & 3
ML13316A359
ML20216E603
ML13316A361
ML20212A406
05000361/LER-1999-005, Forwards 30-day follow-up LER 99-005-00,describing Loss of Physical Train Separation in Control Room.Any Actions Listed Intended to Ensure Continued Compliance with Existing Commitments
gy J usaa Southem Califomia Edison Company 23 PARKER STREET IRVINE CAUFoRNIA 927 80 F.R.NANoY TELEPHONE July 23, 1990 o
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U. S. Nuclear Regulatory Commission Document Control Desk Washington, D. C. 20555
Subject:
Docket No. 50-362 Special Report San Onofre Nuclear Generating Station, Unit 3 This report is being submitted in accordance with Technical Specification (TS) 3.3.3.1, Table 3.3 6, Action 19, of Facility Operating License NpF 15, San Onofre Unit 3. The TS requires Southem '
California Edison (SCE) to submit a Special Report when Condenser Evacuation System Noble Gas
- Activity Monitor 3RE 7870 becomes inoperable for more than 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> during Modes 1,2, and 3 for v
the wide range channel, and during Mode 4 for the normal range channel.
i On July 7,1990, at 0745, Unit 3 entered Mode 4 from the Cycle 5 refueling outage. At that time, TS 3.3.3.1, Action 19, was entered because 3RE-7870 had not been declared operable, due to the lack of process flow, following satisfactory completion of the quarterly channel functional test (CFT) requhed i
On July 8,1990, with the unit in Mode 4, the operations surveillance performed for retuming 3RE-7870 to operable status found the monitor failed. While troubleshooting efforts were in progress, the unit proceeded to Mode 3 on July 14,1990.
Troubleshooting results determined that moisture intruded into the monitor housing, due to 3E 7870
[
being out of service for a period of time following completion of the CFT. Moisture originating from E
air ejector discharge stack accumulated in the monitor discharge line and reached the monitor detector.
Moisture intrusion was prevented on the suction side of the monitor by the sample pump filters.
The monitor discharge line was drained and all affected components were either repaired or replaced.
Appropriate plant startup procedures will be modified to specifically address reviewing return to senice requirements for radiation monitors prior to changing operational modes.
Following completion of satisfactory CFT and operability testing,3RE 7870 was returned to service on July 18,1990.- If you require any additional information, please let me know.
i.
Very truly yours,
/
m
/
cc:
J. B. Martin (Regional Administrator, USNRC Region V)
C. W. Caldwell (USNRC Senior Resident inspector, Units 1,2, and 3)