ML20153F906

Compliance Evaluation Rept Approving Proposed Rev to Technical Safety Requirement 2.2.4.13 Re Autoclave Manual Isolation Sys

ML20153F906
Person / Time
Site:	07007001
Issue date:	09/22/1998
From:	NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
To:
Shared Package
ML20153F900	List: ML20153F897 ML20153F906 ML20153F911
References
NUDOCS 9809290288
Download: ML20153F906 (2)

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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.c. 2055M)01 d* September 22, 1998

• . . * ,o DOCKET: 70-7001 l

CERTIFICATE HOLDER: United States Enrichment Corporation Paducah Gaseous Diffusion Plant Paducah, KY

SUBJECT:

COMPLIANCE EVALUATION REPORT: APPLICATION DATED MAY 29,1998, AUTOCLAVE MANUAL ISOLATION SYSTEM i

BACKGROUND I By letter dated May 29,1998, the United States Enrichment Corporation (USEC) requested j an amendment to Certificate of Compliance GDP-1 for the Paducah Gaseous Diffusion Plant l (PGDP). The request was to revise Technical Safety Requirement (TSR) 2.2.4.13 on the  !

autoclave manual isolation system to add a new condition and required action to cover the l situation where the actuation device in the Area Control Room (ACR) is ino, vable. By letter dated July 9,1998, the staff requested additional justification for the time the ACR actuation de/ ice was allowed to be in an inoperable state. USEC responded by letter dated August 12,1998.

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! DISCUSSION 1

The autoclave manual isolation system provides a mechanism to remotely isolate all the autoclaves in the feed facility in the event of a uranium hexafluoride release from piping outside the autoclave. The manual isolation devices allow the simultaneous isolation of all autoclaves in the affected facility. Placing the autoclave into containment eliminates the l source of uranium hexafluoride available for release thus terminating the release.

1 The system consists of two local (within the feed facilities) actuation devices located in the Operations Monitoring Room and at the cylinder yard crane bay exit, and one remotely located actuation device in the associated cascade building ACR. TSR 2.2.4.13 requires the autoclave manualisolation system actuation devices to be operable while the autoclave l is in the closed mode or in a heating, feeding, or heeling operational mode. The TSR l currently covers the inoperability of the local actuation devices, but does not specifically l cover the inoperability of the remote device in the ACR. The ACR actuation device is a

! backup and would not normally be used for system actuation.

USEC has proposed a specific condition and associated required actions for the

, circumstance in which the ACR actuation device is inoperable. New Condition E will cover i the situation where the actuation device located in the associated ACR is inoperable.

Should the ACR device become inoperable, the new actions require immediate verification that the actuation devices located in the feed facility are operable in accordance with the TSR. If both of the local devices at the feed facility are inoperable, or become inoperable at any time while in proposed Condition E, the TSR would require that the autoclaves be placed in a safe mode within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. Action E.2 requires that the ACR actuation device 9809290288 980922 PDR ADOCK 07007001 C PDR

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I ". bs rrstorcd to optrabla status within 30 days. At least onn of the actuation deviens for the system would be operable prior to beginning any heating, feed or heeling operation. The 30 days is acceptable, since the ACR device is considered a backup and not the primary mechanism, for autoclave isolation.

ENVIRONMENTAL REVIEW lssuance of an amendment to Certificate of Compliance GDP-1 to revise TSR 2.2.4.13 to include a new condition and required action is subject to the categorical exclusion provided in 10 CFR 51.22(c)(19). Therefore, neither an environmental assessment nor an environmental impact statement is required for the proposed action.

CONCLUSION The proposed revision to TSR 2.2.4.13 adds a condition and required action to address the inoperability of the ACR actuation device. This is considered an enhancement in support of the mitigation of a release. The staff recommends that the revised TSR be approved.

The Region ill Inspection staff has no objection to this proposed action.

Princioal Contributor Merri Horn DISTRIBUTION: (Control No. 440S)

Docket 70-7001 NRC File Center PUBLIC Rlli KO'Brien, Rlil NMSS r/f NMSS dir. ofc. r/f FCSS r/f FCOB SPB r/f PHiland, Rlli OFC SPD , m S[$ SPB Sh NAME r: D diey b h l h ay R i rson DATE h/M/98 O /II/98 / 98 $ A9 /98 l C = COVER E = COVER & ENCLOSURE N = NO COPY OFFICIAL RECORD COPY l

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