ML19341A907

Forwards ACRS Re Interim Hydrogen Control Sys Review

ML19341A907
Person / Time
Site:	Sequoyah
Issue date:	01/14/1981
From:	Schwencer A Office of Nuclear Reactor Regulation
To:	Parris H TENNESSEE VALLEY AUTHORITY
References
NUDOCS 8101290209
Download: ML19341A907 (2)

Text

~

.y W,f d'

W W

'. p,'

~ hwi DISTRIBUTION:

hrf.t. h ***;.

- ' ~.

Docket File 50-327/328 7

NRC PDR

~

y 7 4 gggj Local PDR LBa2 File Gary Zeck Docket Nos. 50-327 CStable Nola Hughes and'50-328 MService Susan Cavanaugh IEf3)

BCC: NSIC Mr. H. G. Parris TERA Manager of Power Tennessee Valley Authority 500A Chestnut Street, Tower II Chattanooga, Tennessee 37201

SUBJECT:

ACRS REPORT ON SEQUOYAH NUCLEAR PLANT, UNITS 1 AND 2 13 A copy of a letter to Chainnan Ahearne dated January 27,1981 concerning the Advisory Comittee on Reactor Safeguards' revicw of the interim hydrogen control system proposed for use in the Sequoyth Nuclear Plant, Units 1 and 2, is enclosed for your infomation.

f ~_

f9 Sincerely, e

e,.,

,g J,h (11 U

\\\\

l5) re JAN 191931

• 5 mf va.W # $'

A. Schwencer, Chief Licensing Branch No. 2 h

N 4

Division of Licensing

'o

.;0 7 p

Enclosure:

'D As stated 9

s G.'

cc: See next page V

[]

l bec:

ACRS i

l JA4 2 ng.g,..

)

us s

C),

/

l

/

JO$r 0.-

ASchweNc[er..!.

, ~: > DL.: LB

.DL:Lg#2, DL:LB#.2]

= "> -o MSe.

e:ph. CStMt7e.,

'" l /.. g

./8.1. _.1/..(Y./8.1.. :.l./...l.i../81.,l.

'c(

-.~

w -.: c i. 4 :

v,re:C!A L RICC A O CO PY

Mr. H. G. Parris Manager of Power i

Tennessee Valley Authority 500A Chestnut Street Tower II Chattanooga, Tennessee 37401 cc: Herbert S. Sanger, Jr., Esq.

Generzl Counsel Tennessee Valley Authority 400 Commerce Avenue E 11B 33 Knoxville, Tennessee 37902 Mr. H. N. Culver Tennessee Valley Authority 400 Comerce Avenue, 249A HBB Knoxville, Tennessee 37902 Mr. Bob Faas Westinghouse Electric Corporation P. O. Box 355 Pittsburgh, Pennsylvania 15230 Mr. Mark Bur:ynski Tennessee Valley Authority 400 Chestnut Street Tower II Chattanooga, Tennessee 37401 4

Mr. J. F. Cox Tennessee Valley Authority 400 Comerce Avenue, W10Cl31C Knoxville, Tennessee 37902 Resident Inspector /Sequoyah NPS c/o U.S. Nuclear Regulatory Comission 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 J

l lx

69KtCy o

4 g

/

m'o, UNITED STATES

{ $}

.?

f' ;

NUCLEAR REGULATORY COMMISSION s.

4gy/. $

ADVISORY COMMITTEE ON REACTOR SAFEGUARDS g

wasmNGTON. D. C. 20555 i

• • ..a January 13, 1981 i

Honorable John F. Ahearne Chairman U.S. Nuclear Regulatory Commission Washington, D. C. 20555

SUBJECT:

REPORT ON THE SEQUOYAH NUCLEAR POWER PLANT, UNITS 1 AND 2

Dear Dr. Ahearne:

During the 249th meeting of the ACRS, January 8-10, 1981, we discussed the PRC Staff's review of the interim hydrogen control system proposed for use in the Sequoyah Nuclear Power Plant, Unit 1.

This matter was also discussed at a Subcommittee meeting on January 6, 1981. We have previously commented on this subject in our report dated July 15, 1980 and in two reports dated September 8, 1980.

In this previous correspondence we indicated that distributed ignition systems of the type being considered for use in the Sequoyah plant could pro-vide an improved capability for controlling the burning of a large amount of hydrogen and that the use of such a system would probably reduce risk.

We now believe that tne results of analyses and tests which we have discussed l

with the NRC Staff and the Tennessee Valley Authority (TVA) support these conclusions.

The NRC Staff and TVA are continuing to work together to resolve the issue of the survivability of the equipment within containment which is important to safety. Although much further study is needed to determine the ability of the many essential components to continue to operate after exposure to the conditions imposed by possible hydrogen burning, the conditions imposed l

will not be aggravated by the operation of the ignition system, and in all l

probability will be less severe. We wish to be kept informed of the NRC l

Staff's and TVA's progress in this work.

(

We concur with the NRC Staff recommendation to allow the operation of the Interim Distributed Ignition System and believe that this system will provide improved protection against breach of containment in the event that a substan-tial quantity of hydrogen is generated. We recommend that the NRC Staff and TVA continue their efforts to describe the performance characteristics of the l

system over a broader range of conditions.

Sincerely, J. Carson Mark Chairman DUfE $ I h -l..l. b h fY