View source for PNO-III-88-020, on 880310,sample Results from Unit 1 Sump Indicated Small Amount of Reactor Coolant Leakage Showing Measurements of Less than 0.1 Gpm.Visual Insp Revealed Misting in Reactor Head.Region III Monitoring Situation

{{Adams
| number = ML20148H243
| issue date = 03/11/1988
| title = PNO-III-88-020:on 880310,sample Results from Unit 1 Sump Indicated Small Amount of Reactor Coolant Leakage Showing Measurements of Less than 0.1 Gpm.Visual Insp Revealed Misting in Reactor Head.Region III Monitoring Situation
| author name = Farber M, Jackiw N
| author affiliation = NRC OFFICE OF INSPECTION &amp; ENFORCEMENT (IE REGION III)
| addressee name = 
| addressee affiliation = 
| docket = 05000282
| license number = 
| contact person = 
| document report number = PNO-III-88-020, PNO-III-88-20, NUDOCS 8803290359
| document type = PRELIMINARY NOTIFICATION OF EVENT OR OCCURRENCE (PNO,, TEXT-INSPECTION &amp; AUDIT &amp; I&amp;E CIRCULARS
| page count = 1
}}
{{#Wiki_filter:PRELIMINARYNOTIFICATIONOFFVENTORUNUSUALOCCURRENCE--PNO-III-88-20DateMarch 11, 1988 h rf 3 This preliminary notification constitutes EARLY notice of 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 III staff on this date.
Facility:    Northern States Power                 Licensee Emergency Classification:
Prairie Island Unit 1                       Notification of an Unusual Event Welch, MN 55089                             Alert Site Area Emergency Docket No. 50-282                           General Emergency
                                                  ,X     Not Applicable i

==Subject:==
SHUTDOWN TO REPAIR MINOR LEAK On March 10, 1988, while operating at 80 percent power, sample results from the Unit I sump indicated that a small amount of reactor coolant was leaking. Inventory measurements showed the leakage to be less than 0.1 gallon per minute. The Technical Specification limit for unidentified reactor coolant leakage is 1.0 gallons per minute.
Visual inspection inside containment revealed misting in the area of the reactor head. A later inspection determined that the leak was in a seal weld on an instrument column in the reactor head.
The licensee began a controlled shutdown with cooldows, completed at 3:22 a.m. (CST),
March 11. Preparation for seal weld repairs is in progress. The plant is expected to be shut down for 72 hours. Region III (Chicago) and the resident inspectors are monitoring the situation.
The State of Minnesota will be notified.
Region III was notified of this event at 11 a.m. (CST), March 10, 1988. This information is current as of 10 a.m. (CST), March 11, 1988.
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CONTACT:   M. Farber             .. ac iw FTS 388-5774       /FTS    8-5697 1
I DISTRIBUTION:
H. St.                NMBB            Phillips        E/W        WFN 1 Chairman Zech         XEDU            NRR             DTA        N Com. Roberts          ARM                             01 Comm. Bernthal        E00             AirRights                  Mail To:
Comm. Carr            PA              SLITP F 4 0                 DCS (Original)
Comm. Rogers          OGC                                         DOT (Trans.Only)
SECY OGC-H                 FAX T0:         Nicholson Lane              Regions CA                     INPO Si9&-     RES                         Region I GPA                   NSAC SIMI*                                 Region II ACRS                  Licensee SiO                                Region IV PDR                   Resident Inspector                         Region V                   O \
HOS. OnaraHa- Officer 3:M 8803290359 880311                                        Region III              g6g Rev November 1987 N-I!T88-020DCD}}

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