ML20040C790
| ML20040C790 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 01/25/1982 |
| From: | Tramm T COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8201290242 | |
| Download: ML20040C790 (8) | |
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. January 25, 1982 f
g Mr. Harold RC Deriton, Dirostor s
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U.S.
Nuclea r Regul'atory Commission Washington,-DD 20?>'5 5 M 23 i9825 b 3
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y-Subjecry Byron Station Units 1 and 2
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fBraidwood Station Units 1 an
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A sAdvanca FSAR Information
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Thist Ih 'to' provide advance copies o f information which, will be included in Eke Byi' n/Braidwood FSAR in the ~ t amendment.
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u Attachment A t~o this letter.flists the inform enclosed?
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le t teY.a re,n e (1) signed' orig'inal.and fif ty.-ninp Q9), cQpies of _ thi s
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F1 f teen -(15)3 copies o f,the enclosuies a re incibded for your ' review and approva1.
Please adQress further quSstions t Ah'isotkice.
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ATTACl! MENT A List of Enclosed Information I.
FSAR Question Responses NEW:
022.23 REVISED:
010.53 022.24 022.8 110.63 f
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_l' ASB Item (Revised - response to Subsection 2.1 of 0010.53)
- Section 2:
Response to Additional Short-Term Recommendation 1 2.1 NRC Recommendation The licensee should provide redundant level indication and low level alarms in the control room for the AFN system primary water supply, to allow the operator to anticipate the need to make up water or transfer to an alsernate water supply and prevent a low pump suction pressure condition from occurring.
The low level alarm setpoint should allow at least 20 minutes for operator action, assuming that the largest capacity AFW pump is operating.
Response
Each auxiliary feedwater pump suction is equipped with a low suction pressure alarm.
The alarm setpoint is sufficiently high to allow 20 minutes for the operator to take action prior to the pressure setpoint at which automatic suction switchover occurs if the low pressure condition is a result of low condensate storage tank level.
91 Since the pumps are ultimately supplied by a common header fr.om the condensate storage tank, this scheme provides a redundant indication of low condensate storage tank level.
Additionally, the condensate storage tank is equipped with level indicction in the control room and an.asso-ciated low level alarm.
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- NOTE:
This is the response that is presently in the PSAR.
The response was submitted in Amendment 33.
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00ESTION 022.8
" Provide information on the required instrumentation to monitor containment atmosphere temperature and sump water temperature in the post-accident environment.
Include the instrument range, accuracy, and response l
j time."
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RESPONSE
Modification of the station design to implement Regulatory Guide 1.97, Revision 2 is not complete.
Postaccident monitoring instrumentation will be installed to satisfy Regulatory Guide 1.97, Revision 2; or justification will be provided for any alternatives.
The documentation that demonstrates i
compliance with Regulatory Guide 1.97, or justifies exceptions, will be provided by July 1, 1982.
Instrument range, accuracy, and response time will be included in the documentation.
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B/B-FSAR QUESTION 022.23 1
" Provide an analysis of the effect of the miniflow purge system, i.e.,
an open' purge line, on the minimum containment pressure analysis for performance capability-studies on the ECCS (Reference Branch Technical Position CSB 6-4 B. 5.c). "
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RESPONSE
Refer
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B/B-FSAR QUESTION 022.24
" Provide the assumed essential ccoling water temperature used in FSAR Table 6.2-25 to verify that the minimum essential service water temperature has.been used to maximize the heat removal capacity of the reactor con-tainment fan coolers used in the minimum containment pressure analysis for ECCS performance evaluation (Ref-
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erence Branch Technical Position CSB 6-1). "
RESPONSE
The revised minimum containment pressure analysis for the ECCS performance evaluation will be available by April 1, 1982, i
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B/B-FSAR
"(a)
During initial system heatup and cooldown, at specified temperature intervals for any system which attains operating temperature, verify the snubber expected thermal movement.
" (b)
For those systems which do not attain operating temperature, verify via observation and/or calculation that the snubber will accommodate the projected thermal movement.
" (c)
Verify the snubber swing clearance at specified heatup and cooldown intervals.
Any discrepancies or inconsistencies shall be evaluated for cause and corrected prior to proceeding to the next specified interval.
"The above described operability program for snubbers should be included and documented by the pre-service inspection and pre-operational test programs.
"The pre-service inspection must be a prerequisite for the pre-operational testing of snubber thermal motion.
This test program should be specified in Chapter 14 of the FSAR."
RESPONSE
The following is a discussion of the snubber preservice examination and preoperational testing programs to be imple-mented at Byron Station.
Preservice Visual Examination A documented visual examination will be performed on all safety-related snubbers listed in Tables 3.7-4a and 3.7-4b of the Technical Specifications.
This examination will be performed within 6 months prior to the snubber preoperational testing or, if this is not possible, reverification of items a, b, and c below will be performed.
The visual examination will verify:
a.
No visible indications of damage or potential degraded operability due to the storage, handling or installation of the snubbers.
b.
Adequate swing clearance is provided.
c.
Ilydraulic snubber leak rates are less than equal to design rates.
d.
Snubber attachments are in place and appear secure.
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B/B-FSAR Snubbers that are installed incorrectly or fail to meet the above requirements will be repaired or replaced and reexamined.
The following items are verified during snubber installation:
Installation is as identified cn the design a.
drawings for component supports.
If installation cannot be made per these drawings, component support installation guidelines and tolerances will be used.
b.
Snubbers are not seized, frozen or jammed.
.Prooperational Testing During hot functional testing, the following will be verified for systems whose operating temperature exceeds 250* F:
a.
Snubber movement, as indicated on the snubber, from room temperature to maximum operating tem-perature, is as expected, b.
For systems whose maximum operating temperature is not attained during testing, the expected amount of movement is calculated and evaluated to assure snubbers remain within their stroke capabilities.
ilc.
Snubber swing clearance is adequate.
'The preoperational test program is specified in Chapter 14.0, Tables 14.2-54, 14.2-58 and-14.2-60.
The preservice inspection will be a prerequisite for the preoperational testing.
A detailed program for snubber testing will be provided by March 1, 1982.
Q110.63-3