ML20149H962
| ML20149H962 | |
| Person / Time | |
|---|---|
| Site: | Portsmouth Gaseous Diffusion Plant |
| Issue date: | 07/22/1997 |
| From: | Yawar Faraz NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| To: | |
| Shared Package | |
| ML20149H953 | List: |
| References | |
| NUDOCS 9707250270 | |
| Download: ML20149H962 (2) | |
Text
.
C849
-t UNITED STATES y
s j
NUCLEAR REGULATORY COMMISSION 1"
WASHINGTON, D.C. 20666-4001 4
o 9 *****g July 22, 1997 DOCKET:
70-7002 CERTIFICATE HOLDER:
United States Enrichment Corporation Portsmouth Gaseous Diffusion Plant 1
Portsmouth, Ohio
SUBJECT:
COMPLIANLE EVALUATION REPORT: APPLICATION DATED APRIL 28,1997, AIR GAP DESIGN FEATURE BACKGROUND I
By letter dated April 28,1997, the United States Enrichment Corporation (USEC) j requested an amendment to the Certificate of Compliance for the Portsmouth Gaseous Diffusion Plant (PORTS). The request is to correct a typographical error in the Surveillance Requirement (SR) 2.6.4.2.1 of Technical Safety Requirement (TSR) 2.6.4.2, entitled " Air 4,.
Gaps," by rep! acing the word " pressure" with " presence "
SR 2.6.4.2.1 in the USEC certificate application states:
" Verify and document the pressure of air gaps required by NCSAs" USEC has proposed to revise SR 2.6.4.2.1 to state:
l
" Verify and document the presence of air gaps required by NCSAs" D_lSCUSSION Air gaps are used to prevent back flow to geometrically unsafe systems such as supply tanks and drains. An example of an air gap would ba an opening to the atmosphere at the mouth of a pipe connecting an unsafe geometry system to a safe geometry system. If a thrust is introduced in the safe geometry system, the air gap would prevent the liquid from being forced into the unsafe geometry system by allowing the liquid to overflow through the opening into a safe geometry container.
1 ENVIRONMENTAL REVIEW lssuance of an amendment to Certificate of Compliance GDP-2 by correcting a typographical error in TSR 2.6.4.2 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.
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CONCLUSION lt is appropriate to periodically verify and document the " presence" of all air gaps required by Nuclear Criticality Safety Approvals (NCSAs) to ensure that back flow to a geometrically unsafe system does not occur during normal or upset conditions. No additional safety benefit is gained by verifying and documenting the " pressure" of the air gap, which for an open system would be at atmospheric pressure. Therefore, the staff agrees with USEC that the proposed change involves correction of a typographical error and recommends that the TSR change be approved.
The Region lli inspection staff has no objection to this proposed action.
Princioal Contributor Yawar Faraz DISTRIBUTION: (Control No.100S)
Docket 70-7002 NRC File Center PUBLIC CCox, Rlli KO'Brien, Rlli NMSS r/f NMSS dir. ofc. r/f FCSS r/f SPB r/f PHiland, Rill DHeartland, Rlli KWinsberg, OGC WSchwink, FCOB JDavis, FCOB GMIRGCER.YHF OFC SPB d
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