ML12089A622

NRC Pre-Filed Hearing Exhibit NRC000026 - Case N-776 Alternative to IWA-S244 Requirements for Buried Piping Section XI, Division 1

ML12089A622
Person / Time
Site:	Indian Point
Issue date:	04/09/2010
From:	American Society of Mechanical Engineers (ASME)
To:	Atomic Safety and Licensing Board Panel
SECY RAS
Shared Package
ML12089617	List: ML12089A620 ML12089A621 ML12089A622 ML12089A626
References
RAS 22134, 50-247-LR, 50-286-LR, ASLBP 07-858-03-LR-BD01
Download: ML12089A622 (2)

Text

CASE CASES OF ASME BOILER AND PRESSURE VE.."lSEL CODE N-776 Approval Date: April 9, 2010 Code Cases will remain available for use until annulled by the applicable Standards Committee.

Case N-776 (I) A VT-2 visual examination shall be perfonned to Alternative to IWA-S244 Requirements for Buried identify evidence of leakage on ground surfaces in the Piping vicinity of the buried components and in areas where leak Section XI, Division 1 age might be channeled or accumulated. The examination shall be perfonned after the component has been pressur ized to system leakage test pressure for at least 24 hr.

Inquiry: What alternative to the requirement of Portions of buried components where a VT -2 examination IWA-5244 may be used for examination of buried compo is impractical (e.g., component is buried beneath imperme nents? able material or encased in concrete) are exempt from VT-2 Reply: It is the opinion of the Committee that the follow examination.

ing may be used as an altf~rnative to the requirements of (2) A test that detennines the rate of pressure loss, a IWA-5244 for examination of buried components. test that determines the change in flow between the ends (a) For buried components surrounded by an annulus, of the buried components, or a test that confirms that flow the VT-2 visual examination shall consist of an examina during operation is not impaired shall be performed. Per tion for evidence of leakage at each end of the annulus sonnel performing these tests need not be qualified for and at low point drains. VT-2 visual examination.

(b) For buried components without an annulus, the fol (3) The Owner shall specify criteria for the examina

. lowing examination requirements shall be met: tions and tests of (b)(I) and (b)(2) .

The Committee's function is to establish rules of safety. relating only to pressure integrity. governing the construction of boilers, pressure vessels f transport tanks and nuclear components. and inservic::6 inspection for pressure integrity of nuclear components and transport tanks, and to interprat these rules when questions arise regarding their lntent. This Code does not address other safety issues relating to the construction of boilers, pressure vessels. transport tanks and nuclear components, and the inservice inspection of nuclear compononts and transport tanks, The user of the Code should refer to other pertinent codes. standards. laws, regulations or other relevant documents, 1 (N-776) NC SUPP. 1 Copyright ASME In1ernationai iBPYC)

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