ML20148H457

Forwards Addl Info Request Re Y-pattern Globe & swing-check Msiv.Info Requested by 750623

ML20148H457
Person / Time
Site:	Yankee Rowe
Issue date:	05/13/1975
From:	Purple R Office of Nuclear Reactor Regulation
To:	Andognini G YANKEE ATOMIC ELECTRIC CO.
References
NUDOCS 8011180430
Download: ML20148H457 (3)

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I MAY 131975 1 v Ycnl.ee ite-ic Electric Company

/.TT p : ::r. C. Carl t.nds.3nini, Assistant to the Vice president '

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/dverse operating experience concerning raain steam isolation vcives (hSIVs) hcs been reprtal to the Of fice of Inspection and Inforcement (OI6E) follwiur d operctienal teste and spurious closures et various pWR stations. Ir. an effor?. H to rein c better understanding of thc.e events, Information Recptect lio. 74-2 vcs ss.nt to all PUR stctions by 01&E. The (r formation thus obt aired sas used cc input to a generic review conducted by the Division of Ilentor Licensing. [

Luring cur review, we had the benefit of discussions eith f ersonnel repre- t sentino various velve manuf acturers cnd also with utility representctives <

vhese fccilities were affected.

Ce hcve reviewed the ability of the swing-check type liCIVs to withstcod the dynceic ferer.s associated with rapid closure of such velves in the event of k$

a eter.r lire ru r t u re . As a result of this study, it was determined thct in g sc~e ecscs there r:ay be a reed to upgrade both the catericis and the design Q of the it.rr er swing-check Z:SIVs in order to prevent depredation during normal I.4 service cnd to assure perfornance of all designed safety functions. rhereas F re believe t!.c t adecuate reredici trecoures Scve been identified by the ranu-fcctercrr of the swing-chech type }.:SIVs, ce recuire accurance f rom licensees B t. t e- repriate rer,edici recsures have been or vill be taken in a tit..ely

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70 c.cnner fer Lnoce facilities in rhich svin;;-check ty;< !:51Vs are in s t r.11 e d .

In cddit ien. Le require suncry informatien en the snelyses or tests Lbst N

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t c.ve b e en pe r f or:,ed to c on f i rm t he integrity of those velves under accident cuediticts.

It ritie the course of eur ceneric review cuother type of 1:EIV (c Y-pattern riebe des ign) e::nerienced f ailure during a routine plant startup. Our jg revieo of this occurrence incicates that the cbility of Y-pattern deeienc $

to tolercte the dynan.ic forces associated with postulated ctecc line break M cotzditiers witheut sienificant rechenical dar cre r'unt be similarly reviewed'.

De re f o re , for Y-pat tern riobe valves, we require that analyses or test date h

to substcrtitte the perfor-cr.ce of ecch des.ign under postulcted accident g[

conc'itiors 're subritted to us for review. .E '

d- p T I THIS DOCUMENT CONTAINS _

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Yankee Atomic Electric Company lp '{ -

MAY 131975 s -r/:

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For the Yanke -I< owe plant , please provide by not later then June 23, k.;)$

1975, the infornation requested in the enclosure to this letter. Tnree Qng signed originals and thirty-seven copies are required. V, b$4 This request for generic inf ormation was approved by CAO under a blanket f]i clearance number E-180225 (E0072); this clearance expires July 31, 1977.  :

Sincerely,

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Original signed by: -

Robert A. Purple 1

Fobert A. l'urple, Chief 2 Operating 1:eactors Eranch #1 5 Division of Eeactor Licensing $ k,W t.

Enclosure:

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5 RCUEST FOR ALb1T101AL INFORMATION Y-FATTIT.!: CLOEE A!!D SUIT:C-CEECK pails STEAM ISOLATICI: VALVES 7 l .

Provide a sumary of the aeslyses employed to confire the integrity 1.

of the main steam isolation valves (MSIVs) under the dynamic loads (

casociated with the postulated steam line breaks. Include the i following:

(a) The taxir um calculated impact energy that vill be sustained by vrive internal elements and seating surf aces under the conditions imposed by postulated noin steam line breaks for your station, For Y-pattern globe MSIVs. this recponse ,

should address both forward and reverse flow. .

(b) A sumary of the methods employed to calculate the energy levels given in response to (a) above.  :

(c) A surary of the maximum stress or st rain cr.lculated to '.

occur in the principle elements of the valve cssevbly when y

?4 subject to the impact f orces charact erized in (a) above. x 1 ,e (d) A sur-cry of ar y other rethods or criteria er,: ployed in "

conjunction with or in lieu of the infornction requested in (e), (b), and (c) above to provide assurance that th e y; valve is adequately designed to perforr. the cpecified 4 sefety funct ions. Ih MM YLW If ti.e cnt. lysis bcs been pe rtorn ed by the valve renufccturer $W or other pe rly, referers to this document is sat isf ectory provided thct the (ocument is on file with the st af f . M r

Lescribe any rodifications incorporated in or to be in .:or po ra t ed in %y

2. f; the rain etern isolation valves at your cttt ion. I rovide the present

,$f schedule f or corplet ion of this work. m,,

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