ML20214R104

Special Rept:On 860722 & 0827,during Insp of Entrenched Waste Disposal Piping,Discovered Previously Unknown Fire Barrier Penetration Seals to Be Nonfunctional.Caused by Oversight.Seals Will Be Restored by 861001

ML20214R104
Person / Time
Site:	Fort Calhoun
Issue date:	09/17/1986
From:	Andrews R OMAHA PUBLIC POWER DISTRICT
To:	Martin R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
LIC-86-437, NUDOCS 8609290078
Download: ML20214R104 (2)

Text

_

~

Omaha Public Power District 1623 Harney Omaha. Nebraska 68102 2247 ,

402/536 4000 r/ g %

September 17, 1986 }

g

_~ q j

4 LIC-86-437 SEP 2 219 /3 Mr. Robert D. Martin 3 Regional Administrator L U. S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76011

Reference:

Docket No. 50-285 Special Report on Inoperability of Fire Barriers The Omaha Public Power District, holder of Operating License DPR-40, submits this special report pursuant to the requirements of Fort Calhoun Station Unit No.1 Technical Specification Section 2.19, " Fire Protection System".

Fort Calhoun Station Unit No.1 Technical Specification Section 2.19(7) requires that all penetration fire barriers protecting safety-related areas shall be functional (intact). With a penetration fire barrier nonfunctional, within one hour, either establish a continuous fire watch on at least one side of the affected penetration, or verify the operability of fire detectors on at least one side of the penetration and establish an hourly fire watch patrol.

Restore the nonfunctional penetration to functional status within seven days, or prepare and submit within an additional 30 days a report to the Nuclear Regulatory Commission. This report is being submitted pursuant to Technical

Specification 5.9.3.

l On July 22, 1986, while performing an inspection of entrenched waste disposal piping for leakage, a previously unknown fire barrier penetration seal was discovered at the end of the piping trench separating fire area 21 from fire area 29. Since the seal had not been inspected for operability during the prior 18 month inspection period, it was determined to be nonfunctional and a fire watch was established at that time. This is documented internally by l Operations Incident Report No. 2501. The barrier seal was assigned a number l and included on the inspection logs. Subsequent to this, the seal was degraded on July 28, 1986, to facilitate the repair of the leaking pipe. The fire watch was maintained and the seal will be restored following the repair of the piping per Maintenance Order No. 861224.

l l

8609290078 PDR 860917 ADOCK 05000285 h

- ~ _ . - - 1,o

r. Robert D. Martin Page Two LIC-86-437 To prevent a future occurrence of this nature, an inspection of all entrenched piping was undertaken to determine if any other undocumented fire barrier penetration seals existed. On August 27, 1986, two additional penetration seals were found to be of an unrated design and a fire watch was established at that time. .The first unrated seal separated fire area 29 from fire area 27 and Maintenance Order No. 863202 was written to replace that seal. The second un-rated seal separated fire area 20 from fire area 7 and Maintenance Order No.

863206 was written to replace that seal. Operations Incident Report No. 2545 was written to provide tracking and evaluation of the safety impact of the two unrated seals.

These three fire barrier penetration seals have been inoperable in excess of seven days and an hourly fire watch patrol has been maintained in the affected areas. It is anticipated that all three fire barrier penetration seals will be restored by October 1, 1986. A follow-up report will be issued within 30 days of completion of all work detailing the corrective actions and safety evalua-tion required by the referenced Operations Incident Reports. This special report is being issued within the 30 day limit specified in Technical Specification 2.19(7).

Sincerely, R. L. Andrews Division Manager Nuclear Production RLA/WGG:rge cc: LeBoeuf, Lamb, Leiby & MacRae 1333 New Hampshire Ave., N.W.

Washington, DC 20036 Mr. D. E. Sells, NRC Project Manager Mr. P. H. Harrell, NRC Senior Resident Inspector T. J. McIvor R. J. Mueller J. E. Lechner

%