ML20058K607

Requests Addl Info Re Review of Aug 1973 Rept on Postulated Pipe Failures Outside Containment

ML20058K607
Person / Time
Site:	Monticello
Issue date:	01/18/1974
From:	Ziemann D US ATOMIC ENERGY COMMISSION (AEC)
To:	Ward E NORTHERN STATES POWER CO.
References
NUDOCS 9102120632
Download: ML20058K607 (3)

Text

. t JAN 181974 _

cket ?:o. 50-263 O

Northern States Po'ar Company KirN: Mr. E. C. 1 d 414 Nicollet !!all .

11inneapolis, Minnesota 55401 Gentlemen:

We are reviewing your report dated August 1973 on postulated pipe failures outside containment and have additional questions which are enclosed. References to the pages of your report have been addedadditional which to some questions infomation toisaid you in. identifying the area ~in T j!^1.g p'>

required. yfP +'i Please provide your response to these questions by March 4,1974.

It is requested that the answers be provided with one signed original and thirty-nine additional copies.

Sincerely, Orfcinal S.1gned by:.

Dernis L. Ziemann Dennis L. Ziemann, Oiief Operating Reactors Branch #2 Directorate of Licensing D! closure:

Qwstion List cc w/er. closures:

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thern States Power Company January 18, 1974 cc w/ enclosures:

, anald E. Nelson, Esquire

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crthern States Power Company 4: 4 Nicollet Avenue

Snneapolis, Minnesota 55401 r-s rsld Charnoff c haw, Pitt=an, Potts, Trowbridge & Madden 910 - 17 th S t re e t , N. U.

i::shington, D. C. 20006 Howard J. Vogel, Esquire Knittle & Vogel 814 Plour Exchange Building Minneapolis, Minnesota 55415 S teve Gadler, P. E.

2120 Carter Avenue St. Paul, Minnesota 55108 I:r. Donald L. Ficher City of St. Paul 647 City Hall St. Paul, Minnesota 55102 Ken Drugan Minnesota Pollution Control Agency ,

717 Delaware Street, S. E. l Flnneapolis, Minnesota 55440 I Varren R. Lawson, M. D.

Secretary 6 Executive Officer State Department cf Health 717 Delavare Street, S. E.

'Unneapolis, ."dnnesota 55440 Environnental 7ibrarv of Minnesota Iz21 S. E. 4th Street Mirm spo]is, ':innesat: 55414 Anthony Z. Roisman, Esquire Eerlin, Loistan and Kessler 1712 N Street, N. W.

Washington, D. C. 20036 u -

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f QtESTIONS ON miTIELLO IIIGl INERGY LINE EPDIS OLTTSIDE OF CONTAINAEhT

1. Provide the design pressure of the following-

a. Condenser compartment (parc 16)

b. IIPCI compartment (page 24)

c. RWCU pump and heat exchange rooms (page 29)

d. Main steam chase

2. hhat was the basis of the time of 10 minutes used for operator action? hhat is the maximum time allowed before the safety valves would open? (paragraph 6.2.1. (4) page 19)

3. Submit the details of the additional protection mentioned in paragraph 6.2.2(11. (page 20 and 34) 4 hmce the torus is not strictly a pipe, the statement that the torus will not be damaged because the torus wall thickness is greater than that of the HPCI steam line, may not be accurate.

Similar circumstances on other BhR torus plants necessitated ,

the installation of impact plates or restraints to prevent the IIPCI and RKCU lines from impacting the torus. An analysis must be performed to show the impact energy the HPCI line would have upon the torus. Please submit such an analysis for all high energy lines which could impact the torus. (page 23)

5. hhat are the environmental consequences of a primary steam sample line break on any safety related equipment or cabling?

(page 30)

6. hhat are the environmental consequences of a main steam or feedwater sensing line break on safety related equipment or cabling? (page 32) 7.y

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