ML051380601

Press Release-I-05-029: NRC Reports Preliminary Results of Millstone 3 Special Inspection

ML051380601
Person / Time
Site:	Millstone
Issue date:	05/18/2005
From:	Office of Public Affairs Region I
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Press Release-I-05-029
Download: ML051380601 (2)

See also: see also:Press Release-I-05-029

Text

NRC NEWS

U.S. NUCLEAR REGULATORY COMMISSION

Office of Public Affairs, Region I

475 Allendale Road, King of Prussia, Pa.

Web Site: http://www.nrc.gov/OPA

No. I-05-029 May 18, 2005

Contact: Diane Screnci, 610/337-5330 E-mail: opa1@nrc.gov

Neil Sheehan, 610/337-5331

NRC REPORTS PRELIMINARY RESULTS

OF MILLSTONE 3 SPECIAL INSPECTION

An NRC special inspection team sent to the Millstone 3 nuclear power plant to review an

th

April 17 shutdown has preliminarily concluded the event was caused by an apparent failure of a

circuit card in a computerized reactor protection system. The team has also determined the unit was

safely removed from service by operators, any radiological releases were well below regulatory limits

and there were no public health and safety consequences. However, the team did identify several

inspection findings.

NRC staff will present the preliminary results of the inspection this evening at a meeting of

Connecticuts Nuclear Energy Advisory Council (NEAC). NEACs meeting, which is open to the

public for observation, is scheduled to get under way at 6 p.m. at Waterford Town Hall, 15 Rope Ferry

Road in Waterford, Conn.

The Millstone 2 and 3 nuclear power plants are located in Waterford and operated by

Dominion Resources.

On April 17, Millstone 3 experienced an automatic shutdown from full power. The event

involved the activation of various safety subsystems. As the reactor was shutting down, main steam

line safety valves opened to automatically remove heat generated after the reactor shutdown. One main

steam line safety valve remained open for an extended period of time. It was this condition that

resulted in the declaration of an Alert - the second-lowest of four levels of emergency classification.

In response to the event, the NRC sent a special inspection team to the facility on April 20 to

evaluate the circumstances surrounding the shutdown with complications. Consisting of four full-time

and four part-time inspectors, the team was a multi-disciplined group with diverse backgrounds.

The team has identified several findings, including issues involving the failure of a turbine-

driven pump that is part of a system sometimes used to help cool down the plant, control-room

indicator design issues, minor operator response issues, a delay in the activation of a computer program

used to evaluate plant conditions and the adequacy of the companys boric acid control program. The

NRC has preliminarily determined these findings to be green.

-2-

The NRC uses color-coded inspection findings and performance indicators to assess nuclear

power plant performance. The colors start with green and then increase to white, yellow or

red, commensurate with the safety significance of the issues involved.

The special inspection team has also noted that in response to the event, Dominion made a

timely assessment of radiological conditions and has since launched a review of the shutdown by its

own evaluation team, implemented multiple corrective actions and planned additional evaluations.

After presenting its preliminary findings this evening, the NRC special inspection team will

document its findings and conclusions in a report to be issued within 45 days.