ML20046B164

Special Rept Re Inoperability of post-accident Monitoring Instrumentation Due to Number of Operable Channels Being Less than Min.Preplanned Alternate Method for Monitoring Parameters in Place

ML20046B164
Person / Time
Site:	Fort Calhoun
Issue date:	07/29/1993
From:	Gates W OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LIC-93-0173, LIC-93-173, NUDOCS 9308030209
Download: ML20046B164 (2)

Text

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Omaha Public Power District 444 South 16th Stn:]t Mall Omaha, Nebraska 68102-2247 402/636-2000 July 29, 1993 LIC-93-0173 i j U. S. Nuclear Regulatory Commission j ATTN: Document Control Desk Mail Station P1-137 Washington, DC 20555

Reference:

Docket No. 50-285 Gentlemen:

SUBJECT:

Special Report on Inoperability of Post-Accident Monitoring Instrumentation ,

The Omaha Public Power District (OPPD), holder of Operating License DPR-40, submits this report pursuant to the requirements of Fort Calhoun Station (FCS) Technical Specification (TS)-2.21,

" Post-Accident Monitoring Instrumentation." Technical j Specification 2.21, Table 2-10, specifies the minimum operable channels for several post-accident monitoring instruments. If 1 the required instrumentation is not operable, then the  ;

appropriate actions specified in Table 2-10 are to be taken.

Table 2-10, Items 2 and 3, specify a minimum of one. operable channel ~~c each Wide Range Noble Gas-Stack Monitor (RM-063L, j RM-063M and RM-063H). Footnote (a) of Table 2-10 applies to l these channels and indicates that if the number of-operable fiannels is less than the minimum operable' channels requirement, OPPD must initiate a pre-planned alternate method of monitoring the parameter within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, and.either-restore the inoperable channels to operable status within seven days of the event, or prepare and submit a Special Report to the NRC, pursuant to TS 5.9.3, within fourteen days following the event.

Monitors RM-063L, RM-063M and RM-063H were removed from service on July 19, 1993 as a result of modification MR-FC-84-155C. This modification will enhance the Radiation Monitoring System'and 004 191 9308030209 930729  :

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l U. S. Nuclear Regulatory Commission LIC-93-0173 Page 2 increase the reliability of the Wide Range Noble Gas Stack l Monitors. The scope of this modification includes replacement /

upgrade of radiation monitoring channels RP-063L, RM-063M and RM-063H. The duration of the inoperability of these channels has exceeded seven days, thus requiring this Special Report.

l In accordance with TS Table 2-10, Footnote (a), a pre-planned l alternate method of monitoring the appropriate parameters is in place due to inoperability of the respsctive channels. The pre-planned method uses a G-M tube detector and a portable air

! sampler with one particulate and one charcoal iodine filter to collect and count a sample taken from the Auxiliary Building exhaust stack. The equipment needed to make appropriate connections of the detector and the sampler to the exhaust stack is pre-staged next to the stack. This method is detailed in Operating Instruction OI-PAP-7, Section 4. The modification activities concerning these radiation monitoring channels and their return to service, are scheduled to be completed by the end of the 1993 Refueling Outage.

If you should have any questions, please contact me.

Sincerely, M

W. G. Gates Vice President WGG/grc ,

1 c: LeBoeuf, Lamb, Leiby & MacRae l J. L. Milhoan, NRC Reginnal Administrator, Region IV I S. D. Bloom, N2C Pro 4 . anager R. P. Mullikin, NRC _nior esident Inspector