ML19338F594
| ML19338F594 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 09/02/1980 |
| From: | Seale R AFFILIATION NOT ASSIGNED |
| To: | Quittschreiber Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-CT-1280, NUDOCS 8010200659 | |
| Download: ML19338F594 (1) | |
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' Septesber 2,1980 4
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br. Gary: Quitschreiber
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= Advisory Comunittee on Reactor Safeguards
.-/g U.1 S., Nuclear.Ragulatory/ Commission' 7i.,
'1717:H Street, ' '
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L Washington; D.C. 20555 -
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Dear Sir:
i-I'.am writing;to confirm several comments made at -the recent Class 9 subcom--
i-mittee meeting which dealt;with the -hydrogen problem held ~on August 28.
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continue to' believe that disposal of hydrogen in the containment.b'uilding
' atmosphere: as -it reaches: combustible levels by burning -is the ' appropriate-i-
-course.of. action.
I agree with the proposal made by TVA for.the Sequoya l
Station with a couple of reservations as noted below.
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First of kil.. I continue to"believe 'thac the appropriate location for such i:
ignitors would not be' necessarily. at the' location of existing lighting fixtures.
The' criteria for such placement should be more than just.the convenience in providing appropriate. power. -Indeed, some further cossment on what the appro-priate criteria:for-location should be. requested, taking into consideration L
the likely sources; of-injection.of hydrogen into the containment. atmosphere.
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Such sources include coolant' r,ystem' vent lines, the rupture disc on pressurizer-surge tanks, the: housings' around primary coolant' pumps, etc.
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i Certainly the approach taken in identifying diesel engine glowplugs as the
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likely ignitor was.very direct and generally convincing. There are some 4
remaining, questions, however, regarding.the long term operability c'f the glowplug in'the primary. containnunt system environment; and indeed I have-some, concern as to whether or not it would be a suitable ignitor after exposure
.s to the' environment. Possible. corrosion of the' surface is the particular problem. Als'ol in. view of our concerns about common mode failure, it might be~ appropriate to have other types of ignitors present.
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Finally, it is assumed thatLan appropriate in-service testing program would-j be'a designed partfof any implementation of.theLuse of ignitors. While it is j^:
recognized that these tests. do not imply the injection of hydrogen.into the l
' system to.see if the ignitors will do their thing, it does appear appropriate
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m to monitor..the temperature of the'ignitor while energized in such tes'ts.
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. Finally let me'~ comment that it is quite. impressive-to see the positive cattitude inDattacking-the solution to-this. problem.
fis. laudable.
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.'The initiative;shown 4
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.1 Very truly yours,
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Robert L.'Seale TRLSdgj
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