Headquarters Daily Report
APRIL 18, 2000
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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 - REGION IV APRIL 18, 2000
Licensee/Facility: Notification:
Nebraska Public Power District MR Number: 4-00-0012
Cooper 1 Date: 04/18/00
Brownville,Nebraska RIs by phone
Dockets: 50-298
BWR/GE-4
Subject: EQUIPMENT QUALIFICATION DEFICIENCIES WITH OKONITE TAPED SPLICES
Discussion:
On April 10, 2000, licensee management informed the resident inspectors
that drywell temperature profiles during design basis accidents may
exceed their equipment qualification test temperatures. Subsequent
review by the licensee determined that the overall concern with the
environmental qualification of drywell equipment was bounded by existing
test results, as long as all electrical splices were in the configuration
bounded by the test. To help confirm the actual configuratin, on April
14, a licensee electrician and the NRC's resident inspector entered the
containment to inspect a sample of splices. The electrician and resident
inspector observed that, for most of the Okonite splices observed, the
outer tape was unraveling. This called into question the overall
environmental qualification capability of all Okinite splices within the
containment. Based upon these findings, the licensee is currently
considering the replacement, as needed, of all nonconforming splices with
qualified materials; however, they are also conducting evaluations in an
effort to qualify the as-found condition. The licensee is also reviewing
the equipment affected by the Okonite splices. Equipment already
identified as being affected includes motor-operated valves in the
reactor core isolation cooling and high pressure coolant injection
systems. Additionally, Regulatory Guide 1.97 instrumentation cables are
affected. Licensee personnel are continuing to evaluate the scope and
extent of this condition. Initial determination of risk significance is
at least a Green-White borderline condition.
Regional Action:
Supplemental inspection to be conducted, in accordance with Procedure
95001.
Contact: David Loveless (817)860-8161
C. Marschall (817)860-8185
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