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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