PNO-I-87-119, on 871223,reactor Scrammed Due to Leak from Intermediate Waterbox Manway C.Caused by Failure of Manway Gasket.Waterbox C Isolated & Spill Terminated.Water in Condenser Bay Area Measured 43 Inches
| ML20238C456 | |
| Person / Time | |
|---|---|
| Site: | Susquehanna  |
| Issue date: | 12/24/1987 |
| From: | Blough R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| References | |
| PNO-I-87-119, NUDOCS 8712310021 | |
| Download: ML20238C456 (1) | |
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DCS No:
50387871223 Date:
December 24, 1987 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PND-I-87-119 This preliminary notification constitutes EARLY notice a: events of POSSIBLE safety or public interest significance. The information is as initially received without verification or evaluation, and is basically all that is known by the Region I staff on this date.
Facility:
Licensee Emergency Classification:
Pennsylvania Power & Light Co.
Notification of Unusual Event Susquehanna Unit 1 Alert Berwick, Pennsylvania Site Area Emergency Docket No. 50-387 General Emergency X
Not Applicable
Subject:
UNPLANNED SHUTDOWN (EXCEEDING 48 HOURS) DUE TO FLOODING IN CONDENSER BAY At 2:40 p.m. on December 23, 1987, with the reactor at 11 percent power and the generator still off-line following a December 18 shutdown, a leak occurred from the
'C' Intermediate Pressure Waterbox manway on the Unit I condenser when its manway gasket failed. Approximately 220,000 gallons of (nonradioactive) water from the circulating water side flooded the condenser bay area and onto the floor of adjoining areas (including some slightly contaminated areas).
The licensee began reactor shutdown by manually inserting control rods at 3:08 p.m., but when efforts to isolate the 'C' waterbox failed due to difficulty in completely closing the outlet valve, the reactor was scrammed at 3:52 p.m.
The licensee was eventually able to isolate 'C' waterbox and terminate the spill.
Water level in the condenser bay area when measured was 43 inches. Some of the water was transferred to the Condensate Storage Tank Berm to await processing. Water level in the condenser bay area is presently at 30 inches and awaiting processing through radwaste. The reactor is stable with primary system pressure at 89 psig and cool down proceeding with reactor vessel level being maintained by RCIC.
There were no significant effects on or interactions with equipment or systems outside of the condenser bay area involved in this event.
Unit 2 operation was unaffected.
The licensee has issued a press release.
This PN is issued for information only.
Region I received notification of this event at 4:10 pm., December 23 by the telephone call from the Resident Inspector, who was on site during this event and continues to follow licensee actions. The reactor will remain shutdown for several days while the licensee inspects and repairs waterbox outlet valves.
CONTACT: R. Blough 488-1146 DISTRIBUTION:
H. St.
MNBB Phillips E/W Willste Mail:
ADM:DMB Chairman Zech EDO NRR NMSS DOT:Trans only Comm. Roberts PA OIA RES i
Comm. Bernthal OGC AEOD NRC Ops Crt Comm. Carr l
Comm. Rogers NSACk'--k ACRS Air Rights INPO-SECY SP
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CA PDR Regional Offices TMI Resident Section // b s RI Resident Office Licensee:
(Reactor Licensees)
Region I Form 83 (Rev. August 1987) 8712310021 871224 7I O
POR IEE 7C L
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