ML17037C120
| ML17037C120 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 04/19/1973 |
| From: | Raymond P Niagara Mohawk Power Corp |
| To: | Skovholt D Niagara Mohawk Power Corp |
| References | |
| Download: ML17037C120 (6) | |
Text
AEC DISTR
>ION FOR PART 0 DOCKET MATER TEA'rZORARX i OR<pi k
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2627 FBOM!
, Niagara Mohawk Ebwer Corporatio>
- Syracuse, N. Y.
13202 Philip D. Raymond DATE OF DOC:
4-19-73 DATE REC'D LTR 0-20-73'MEi'iO Mr. Skovholt ORIG 3 signe CC CTHE R MhV. A.C iDiR X
SZiPi. LOCAL PjpR X
CLASS:
U PROP IiiFO NO CXS REC'D DOCMT iiO:
50-220 QESORIP1IOAV:
Ltr notarized. 4-19-73p
'urnishing addi info'o their 1-31-73,ltr containing a description of a hydrogen ",gette located. in the upper. plenum of the fuel rods in Type 4 reloa'd. fuel........
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DOCKET CLERK g
300 ERIE BOULEVARD WEST SYRACUSE. N. Y. 'I3202 April 19, 1973 Mr. Donald J. Skovholt Assistant Director for Operating Reactors Directorate of Licensing United States Atomic Energy Commission Washington, D. C.
20545 Re:
Nine Mile Point Unit 1 Docket No. 50-220
Dear Mr. Skovholt:
Niagara Mohawk's letter of January 31, 1973, contained a
description of a hydrogen "getter" located in the upper plenum of the fuel rods in Type 4 reload fuel.
This communication documents information previously provided to the Commission Staff for its review of the Type 4 reload fuel.
A hydrogen getter is located in the upper plenum of each fuel rod in the Type 4 fuel.
The hydrogen getter is an added pre-caution against clad hydriding that might result from incomplete removal of hydrogen impurities in the fuel rod during fabrication; extraneous hydrogen impurities will combine chemically with the getter in preference to zircaloy cladding.
The getter is composed of chips of a zirconium alloy located in a stainless steel container in the upper plenum.
Extensive testing has shown that the getter is effective for temperatures beyond the range anticipated for a BWR fuel rod plenum and will not release hydrogen during normal operation, or under tiansients or accident conditions.
The getter material chip size has been selected such that the getter will not undergo a chemical reaction contributing to P
the severity of transients and accidents.
The getter operating conditions are defined by the coolant temperature at the plenum area of the rod.
Under normal operation conditions the plenum temperature is between 550 F to 600 F.
During abnormal'ransients or accident conditions the plenum region temperatures would range from 300 F to 600 F.
The getter chips are inactive below 450 F and active'in adsorbing and retaining hydrogen from 450 F to 0
t/
I C
IN I k4
Mr. Donald J. Skovholt April 19, 1973 beyond 600 F.
The corrosion products of these reactions are confined within the stainless steel jacket containing the getter.
The rate of reaction of the getter with air, steam or hydrogen is not pyrophoric in the temperature range experienced in a BWR fuel rod.
Therefore, the getter will combine chemically with extraneous hydrogen during normal operation, and not release hydrogen or otherwise contri-bute to the severity of abnormal transients or postulated accidents.
,Very truly yours, PDR/vk 1
Philip D. Raymond Vice President-,Engineering u,
Subscribed and swoyn to before me this lFM day of April 1973.
Notary Public CAROLYN F. ROBERTSON Notary Public in the State of New York Qtrelitfert in Onon. Co. No. 34 8599125 My Commission Expires March 30, 19M
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