PNO-II-88-004, on 880113,licensee Identified Resin Intrusion from Powdex Demineralizer Sys Into Secondary Side of Steam Generator.Resin Causes Formation of Sulphates,Believed to Be Prime Cause of Steam Generator Tube Failures

PNO-II-88-004:on 880113,licensee Identified Resin Intrusion from Powdex Demineralizer Sys Into Secondary Side of Steam Generator.Resin Causes Formation of Sulphates,Believed to Be Prime Cause of Steam Generator Tube Failures

ML20149E518
Person / Time
Site:	North Anna
Issue date:	01/14/1988
From:	Cantrell F NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
PNO-II-88-004, PNO-II-88-4, NUDOCS 8802110090
Download: ML20149E518 (1)

, -- -

( )WmMte d u io. 55DO ctf 0 .0 D p m. ] M . % A ? S Y January 14, 1988 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-II-88-04 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance. The information is as initially received without verifi-cation or evaluation, and is basically all that is known by the Region II staff on this date.

FACILITY: Virginia Electric & Power Company Licensee Emergency Classification:

North Anna Unit 1 Notification of Unusual Event Docket No. 50-338 Alert Mineral, Virginia Site Area Emergency General Emergency X Not Applicable

SUBJECT:

FIFTEEN DAY MAINTENANCE OUTAGE INITIATED BY RESIN INTRUSION INTO STEAM GENERATOR After returning to criticality following a reactor trip from about 15 percent power on January 13, 1988, the licensee identified a resin intrusion from the Powdex Demineralizer System into the secondary side of the steam generator. With the reactor at operating temperature, resin causes a formation of sulphates which is believed to be a prime cause of steam generator tube failures. The Owners Group Guidelines for secondary water chemistry require that sulphate be less than 100 PPB prior to increasing reactor power above 5 percent. Unit I was held at 5 percent for an extended period before increasing power in order to meet the guidelines. Current plans are to hold the reactor at about 350' F. to facilitate "hideout return" and to bring the sulphates into solution and then drain and flush the steam generator. VEPC0 is investigating to determine the cause of the resin intrusion.

The resident inspector is on site and is following the licensee's program.

The Comonwealth of Virginia has been info:ved.

The NRC received initial notification of this event from the licensee to the resident inspector about 4:00 p.m. (EST) on January 13, 1988.

This information is current as of 11:00 a.m. (EST) on January 14.

Contact:

F. S. Cantrell - 242-5534 Distribution H. Street MNBB Phillips E/W Willste Regions Chairman Zech XT66 NRR 61% NMSS Region I # N. f '

Com. Roberts ARM 01 Region II Com. Bernthal ED0 Region III / 7l 3 7 Com. Carr PA Region IV - /

Com. Roders OGC AirRights RegionV--.~~/

SECY SLITP OGC-H CA FAX T0: MAIL T0:

GPA INPO-'7!h' Nicholson Lane RES DCS Original)

ACRS NSAC - DOT Trans. only)

PDR LICENSEE OM 3 RESIDENT INSPECTOR ~ b, q

\q HQS. OPERATIONS OFFICER };

one **************************************************************************************

8802110090 000114 E-IN8-OO4 PDR g )