IR 05000285/1993003
| ML20044G824 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 05/24/1993 |
| From: | Beach A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Tira Patterson OMAHA PUBLIC POWER DISTRICT |
| References | |
| NUDOCS 9306040320 | |
| Download: ML20044G824 (4) | |
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jaafGo UNIVED STATES
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fg NUCLEAR REGULATORY COMMISSION
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611 RYAN PLAZA DRIVE, SUITE 400 c.
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AR LtNGTON, TEXAS 76011-8064 MAY 2 41933
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Docket:
50-285 License: DPR-40 Omaha Public Power District ATTN:
T. L. Patterson, Division Manager Nuclear Operations 444 South 16th Street Mall Mail Stop 8E/EP 4 Omaha, Nebraska 68102-2247
SUBJECT:
NRC INSPECTION REPORT 50-285/93-03
Thank you for your letter of May 4,1993, in response to our letter and Notice of Violation dated April 5, 1993. We have reviewed your reply and find it responsive to the concerns raised in our Notice of Violation. We will review the implementation of your corrective actions during a future
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inspection to determine that full compliance has been achieved and will be maintained.
Sincerely,
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[.BillBeach, Director Division of Reactor Projects cc:
LeBoeuf, Lamb, Leiby & MacRae ATTN: Harry H. Voigt, Esq.
1875 Connecticut Avenue, NW Washington, D.C.
20009-5728 Washington County Board of Supervisors ATTN: Jack Jensen, Chairman Blair, Nebraska 68008 9306040320 930524 PDR ADDCK 05000285 G
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Omaha Public Power District-2-
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Combustion Engineering, Inc.
ATTN: Charles B. Brinkman, Manager
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Washington Nuclear Operations
12300 Twinbrook Parkway, Suite 330
Rockville, Maryland 20852
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Nebraska Department of Health
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ATTN: Harold Borchert, Director
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Division of Radiological Health
301 Centennial Mall, South P.O. Box 95007
Lincoln, Nebraska 68509-5007 l
Fort Calhoun Station
ATTN: James W. Chase, Manager P.O. Box 399
Fort Calhoun, Nebraska 68023 j
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Omaha Public Power District-3-pg g g g bcc to DMB (IE01)
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bec distrib. by RIV:
J. L. Milhoan Resident Inspector DRSS-FIPS MIS System RIV File DRP Section Chief (DRP/TSS)
DRS Lisa Shea, RM/ALF, MS: MNBB 4503 Senior Resident Inspector - Cooper
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J. L. Milhoan Resident Inspector DRSS-FIPS MIS System RIV File DRP Section Chief (DRP/TSS)
DRS Lisa Shea, RM/ALF, MS: MNBB 4503 Senior Resident Inspector - Cooper
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Omaha Public Power Distdct P.O. Box 399 Hwy.75-North of Ft Calhoun Fort CalhouANE68023-0399
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May 4, 1993 liI!
LIC-93-0058 fg
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Nuclear Regulatory Commission
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ATTN: Document Control Desk Mail Station PI-137 Washington, DC 20555 References:
1.
Docket No. 50-285 2. Letter from NRC (A. B. Beach) to OPPD (T.
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Patterson) dated April 5, 1993 Gentlemen:
SUBJECT:
NRC Inspection Report No. 50-285/93-03 Reply to a
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The subject report transmitted a NOV resulting from an NRC inspection conducted January 31 through March 13, 1993 at the Fort Calhoun Station.
Attached is the Omaha Public Power
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District (OPPD) response to this NOV.
If you should have any questions, please contact me.
Sincerely, k
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W.
G.
Gates
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- A Vice President
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Attachment
WGG/cfs c:
LeBoeuf, Lamb, Leiby & MacRae
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L. Milhoan, NRC Regional Administrator, Region IV R.
P. Mullikin, NRC Senior Resident Inspector
S.
D.
Bloom, NRC Project Manager
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Attachment LIC-93-0058 Page 1 REPLY TO A NOTICE OF VIOLATIOH
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VIOLATION During an NRC inspection conducted on January 31 through March 13, 1993, a violation of NRC requirements was identified.
In accordance with the " General Statement of Policy and Procedure for NRC Enforcement Actions," 10 CFR Part 2, Appendix C, the violation is listed below:
Technical Specification 2.15(1) states, "In the event the number of channels of a particular cycte= in service falls one below the total number of installed channels,-the inoperable channel shall be placed in either the bypassed or
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tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
If the inoperable channel is not restored to operable status after the allowable time for bypass (48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />), it shall be placed in the tripped
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position."
Contrary to the above, on October 30, 1992, after swapping Power Range Control Channels A and B for the Power Range
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Safety Channels A and D (following the failure of a detector), the licensee failed to perform adequate post-maintenance testing to determine operability, thus failing to detect that the signal cables for the nuclear instrumentation subchannels were misaligned, causing Channel D Reactor Protective System Trip Units 1, 9,
and 12, to remain inoperable until they were detected on March 1, 1993.
The licensee failed during this time period to place Channel
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D trip units in the tripped position.
This is a Severity Level IV violation.
OPPD ResDonse
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Reason for Violation This event was detailed in Licensee Event Report (LER)
'93-004.
A Root Cause Analysis (RCA) was also completed by Omaha Public Power District (OPPD) for this event.
The Reactor Protective System (RPS) Channel D trip units were
declared inoperable on March 1, 1993 when it was discovered i
that the Axial Shape Index (ASI) response for Channel D was opposite the other channels.
This was due to the two Power j
Range Nuclear Instrumentation (PRNI) subchannel input cables
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being reversed.
These cables had been moved to Safety Channel D from Control Channel B via Temporary Modification
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TM-92-078 on October 31, 1992.
It has been determined that
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the subchannel cables for the Control Channel detector had most likely been reversed since initial startup in 1973.
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Attachment i
LIC-93-0058 l
Page 2 i
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Reason for Violation (Continued)
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Fort'Calhoun had been maintained at a nominal 100% power I
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from installation of the temporary modification until a' slow
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power reduction was initiated on February 24, 1993.
The
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reversed response of Channel D RPS ASI was identified during the evaluation of data from the power reduction.
Positive
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verification of the response of the subchannels after the
installation of the temporary modification would have.
identified the reversed cable problem.
Therefore, the cause of the violation was insufficient post-temporary i,
modification testing and insufficient requirements for review of testing specified for temporary modifications.
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Drawing discrepancies may have contributed to failures to identify the pre-existing wiring problem.
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2.
Corrective Actions That Have Been Taken Temporary Modification TM-92-078 was revised to interchange
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the subchannel input cables for Safety Channel D.
After the
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cables were exchanged, the ASI response for all four RPS Channels was verified to respond correctly by inserting a.
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control rod regulating group.
These actions were completed j
March 1, 1993.
i Standing Order 0-25, _" Temporary Modification Control" has
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been revised to provide additional guidance on-determining
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-functional testing requirements..The revised procedure
requires testing requirements to be evaluated'for the
functions of the affected equipment.
Documentation of this
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evaluation will now be included with the temporary'
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modification package for Plant Review Committee ~(PRC) review
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and approval.
The revised' procedure was' issued March 31, j
1993.
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The adequacy of post-modification testing'for temporary modifications installed as of March 1, 1993 was reviewed and
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confirmed.
This was completed March 5,_ 1993.-
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i The post-modification. testing process for permanent j
modifications was reviewed and determined to'be adequate.
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This was completed March 5,-1993.
3.
Corrective Actions That Will Be Taken l
Engineering Change Notice ECN-92-057 will correct identified
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discrepancies on applicable drawings of PRNI detector
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cabling.
These drawing updates will be completed by May 21,
1993.
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Attachment
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LIC-93-0058 Page 3
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3.
Corrective Actions That Will Be Taken (Continued)
Maintenance Work Order (MWO) 924386 has been initiated for i
investigation of identified labeling discrepancies involving.
PRNI cables.
This MWO will require verification that labeling is consistent with the approved configuration and will be completed by the end of the 1993 Refueling Outage.
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4.
Date of Full Compliance OPPD is presently in full compliance.
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