United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for June 11, 2001

                       Headquarters Daily Report

                         JUNE 11, 2001

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                    REPORT             NEGATIVE            NO INPUT
                    ATTACHED           INPUT RECEIVED      RECEIVED

HEADQUARTERS        X
REGION I                               X
REGION II                              X
REGION III                             X
REGION IV                              X
PRIORITY ATTENTION REQUIRED  MORNING REPORT - HEADQUARTERS JUNE 11, 2001

Licensee/Facility:                     Notification:

Part 21 Database                       MR Number: H-01-0042
Conval                                 Date: 06/11/01
Somers,Connecticut

Subject: Part 21 - Flow coefficients less than procurement specification
         for ball check valves


Discussion:

VENDOR: Conval                      PT21 FILE NO: m1-20-0

DATE OF DOCUMENT: 05/23/01          ACCESSION NUMBER: ML011500422

SOURCE DOCUMENT: EN 38027           REVIEWER: REXB, V. Hodge

The valve vendor Conval reports a noncompliance involving flow
coefficients for ball check valves with the angle pattern or tee pattern
body style used in charging water riser isolation and scram discharge
riser isolation applications. The vendor learned from tests that the flow
coefficient values for both styles are less than 1.5, though procurement
documents specify higher values. In one case, scram time increased from
1.5 seconds to 2 seconds. The vendor states that it notified both the
affected domestic nuclear power plants at Oyster Creek and Nine Mile
Point Unit 1.

The NRC will post ensuing reports on this subject on its Web site at
http://www.nrc.gov/NRC/PUBLIC/PART21/2001.

Contact:    V. Hodge, NRR
            301-415-1861
            E-mail: cvh@nrc.gov
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