ML19327A651

Forwards N Lauben Memo Re Technical Issues Raised in Dpv Concerning Containment Isolation Valves at Facilities. Rupture of High Burnup Fuel Pins During Blowdown Transient Not Credible for Existing Fuel Designs

ML19327A651
Person / Time
Site:	Zion  File:ZionSolutions icon.png
Issue date:	08/10/1989
From:	Hodges M Office of Nuclear Reactor Regulation
To:	Thadani A Office of Nuclear Reactor Regulation
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References
TAC-73427, NUDOCS 8908140173
Download: ML19327A651 (1)

Text

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ENCLOSURE 1 AUS101988 i

l NOTE T0:

Ashok Thadani, Assistant Director i

for Systems o

Division of Engineering 4 Systems Technology Office of Nuclear Reactor Regulation I

FROM:

M. Wayne Hodges, Chief Reactor Systems Branch

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Division of Engineering & Systems Technology Office of Nuclear Reactor Regulation

$UBJECT:

DPV CONCERNING CONTAINMENT ISOLATION VALVES AT !!0N 4

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i The attached memorandum from Norm Lauben addresses most of the technical issues raised in the DPV. The analyses performed by Nom Lauben do indicate i

the potential for fuel pin rupture during blowdown for very high power pins.

for pire powers which exist for current fuel designs, no slowdown However,is predicted. Therefore, pin rupture during blowdown is not a problem rupture for existing designs but should be checked for future designs, i

l The fuel failure criteria described in Chapter 4 of the Standard Review Plan

($RP) could be interpreted to apply to LOCA analyses in the absence of staff r

I practice. However, staff practice has never (at least not since 1974 when !

l joined the staff) been to assume fuel failure upon inception of DNS for LOCA i

analyses. Perhaps, the $RP should be revised to more clei.rly describe staff f

i practice, but I do not believe the effort to be worth the test in staff i

resources.

i Based upon the enclosed analyses and discussions with several staff experts (R. Meyer, R. Jones, L. Rubenstein), I do not believe that rupture of high burnup fuel pins during the blowdown transient to be credible for existing i

fuel designs. However, it is appropriate to verify that blowdown rupture does not occur for future designs.

eminal atmos e, l

ahm H.dus j

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M. Wayne Hodges, Branch Reactor Systems Division of Engineering 4 Systems Technology Office of Nuclear Reactor Regulation l

Enclosures:

As stated

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