ML20058D916
| ML20058D916 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 07/14/1982 |
| From: | Ray H SOUTHERN CALIFORNIA EDISON CO. |
| To: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| References | |
| NUDOCS 8207270440 | |
| Download: ML20058D916 (4) | |
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July 14, 1982 j
U. S. Nuclear Regulatory Commission Office of Inspection and Enforcement j
Region V j
1450 Maria Lane, Suite 210 Walnut Creek, CA 94596-5368 Attention:
Mr. R. H. Engelken, Regional Administrator i
Dear Sir:
f j
Subject:
Docket No. 50-206 j
Special Report Regarding Fire Detection Instrumentation and Fire Suppression Systems l
San Onofre Nuclear Generating Station, Unit 1 j
Pursuant to.Section 6.9.3.c of the Technical Specifications for Unit 1, this Special Report is being submitted as required by Technical Speci-fication Paragraph 3.14.b.(4)b for Fire Detection instrumentation, and Paragraph 3.14.B(2)b for Spray and Sprinkler Systems. The Technical l
Specifications require restoring inoperable fire protection systems to l
operable status within 14 days or submitting a Special Report within the j
next 30 days to the Commission. This period has been exceeded for certain fire detection systems in Unit 1.
The course of action taken, cause of detector or spray system inoperability and the schedule for restoring the instruments or systems to operable status are outlined below.
Zone 2 and 3 Fire detectors in Zones 2 and 3 (defined in Table 3.14.2 of the Technical Specifications) were taken out of service on May 13, 1982, prior to installing ventilation and cooling systems in the 480-V and 4160-V i
switchgear rooms. In both rooms, fire watches were established before the detection system was removed from service, with an hourly patrol in Zone 2 and a continuous fire watch in Zone 3.
These fire watches will continue until the systems are restored to service.
i 8207270440 820714 PDR ADOCK 05000206 S-PDR
E Mr. R. H. Engelken July 14, 1982 Course of Action Prior to the scheduled removal of the fire detection instruments from service in Zones 2 and 3, fire watches as specified in Section 3.14.B(4)a of the Technical Specifications were established. Extensive work for the Installation of air conditioning systems in both switchgear rooms required cutting and grinding. The resulting dust would have caused spurious alarms of the fire detection instrumentation.
In addition, it was necessary to remove the fire detectors of Zones 2 and 3 from service because of work to reinforce the building structures against seismic loads.
Cause of inoperability Scheduled removal f rom service of instruments to prevent spurious alarms caused by construction work rendered the fire detection systems inoperable.
Schedule for System Restoration The fire detection systems in Zones 2 and 3 will be returned to service when the construction work for the seismic upgrading and the installation of ventilation systems are concluded. The seismic upgrading, which w!:1 determine the length of the fire detection systems outage, is scheduled to be finished by November 1, 1982. The ventilation and cooling system for Zone 2 will be in place on August 1, 1982 and for Zone 3 at the end of August, 1982.
Both fire detection system outages should have been reported by June 26, 1982.
Zones 10 and 16 Similar to Zones 2 and 3, the fire detectors in the containment sphere outside of the secondary shield (Zone 10) and in the sphere enclosure building (Zone 16) were taken out of service because of scheduled work in these areas that would have interfered with the normal functioning of the fire detection systems.
Course of Action Fire watches as specified in Technical Specification Section 3.14.B.(4)a were established in both Zones prior to the scheduled removal of the fire detection systems from service. Construction vork to reinforce building structures against seismic loads would have triggered false alarms of the systems.
In addition, four new fire detectors were installed in both Zones and 42 thermal detectors were installed in Zone 16.
Mr. R. H. Engelken July 14, 1982 Cause of inoperability Scheduled construction work and installation of additional fire detectors required the removal of the fire detection systems from service to prevent spurious signals.
Schedule for System Restoration The critical item determining the res1 oration of the fire detection systems in Zones 10 and 16 is the seismic upgrading work presently being carried out in Unit 1.
This work is expected to be completed by the end of November, 1982. The hourly fire watches will continue until the fire detection systems are returned to service.
The outage of the fire detection instrumentation in the containment sphere (Zone 10) should have been reported by June 25, 1982, and that of the fire detectors in the enclosure building (Zone 16) by June 9, 1982.
Containment Spray System On June II, 1982, the containment spray system was taken out of service.
According to the Technical Specifications, a Special Report has to be submitted to the Commission before July 26, 1982.
Course of Action Two valves (CV 517 and 518) in the containment spray system downstream of the refueling water pump have been opened to check their plug position.
The opening of the valve bodies required the removal of the containment spray system from service. Operability tests of both valves by cycling the rotary plugs are also scheduled. A continuous fire watch with backup fire suppression equipment has been maintained since the removal of the spray system from service.
Cause of inoperability The opening of the valve body plugs made the containment spray system inoperable and required its removal from service.
Schedule for System Restoration The work on valves CV517 and CV518 will be finished by August 1, 1982.
Subsequently, scheduled work on support systems in the containment dome will require the removal of the containment spray system from service.
This service outage is scheduled to end by October 1, 1982.
e Mr. R. H. Engelken July 14, 1982 The following corrective steps have been taken to prevent late reporting on fire protection equipment in the future.
1.
All responsibilities associated with fire protection systems are now tracked by one person in the Emergency Preparedness Division.
This includes fire protection system operability, surveillance, maintenance, repairs and reporting.
2.
New fire protection procedure 50123-XIll-26, " Fire Protection impairment", was issued on July 12, 1982.
This procedure will improve the information flow between the organizations responsible for operations and emergency preparedness.
3.
All fire detection, fire suppression and sprinkler systems have been inspected to verify the current equiprent status.
This inspection was completed on July 9, 1982.
Together, these measures will result in accurate tracking of the equipment status and, thus, prevent late reporting.
If you have f urther questions regarding this matter or need additional information, please do not hesitate to let me know.
Sincerely,
,s' Mr. L. F. Miller (USNRC Resident inspector, San Onofre Unit 1) cc: