ML19345D190
| ML19345D190 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/22/1980 |
| From: | Trimble D ARKANSAS POWER & LIGHT CO. |
| To: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| References | |
| 1-090-20, 1-90-20, 2-090-29, 2-90-29, IEB-80-18, NUDOCS 8012120156 | |
| Download: ML19345D190 (3) | |
Text
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APKANSAS PCWER & UGH 7 CCMPANY CST CFACE SCX 551 UW CCCK. &< MAS 722C3 (5CH 3716 a
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Septecoer 22, 1980
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2-090-29 4
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- 9. K. V. Seyfrit, Di rec or Office of Inspecticn & Enforcement U. S. Nuclear Regulatory Coma.
Region IV 511 Ryan Pla:a Drive, Suite 1000 Arlington, Texas 750 11 S' 3 JECT: Arkansas Nuclear One - Units 1 & 2 d
Docket Ncs. 50-313 and 50-268 License Nos. DPR-51 and NPF-6 Resconse to IE Bulletin 80-18 (File: 15 10. 1, 2-15 10. 1)
Gentlemen:
Tne referenced Bulletin requested information on the ANO - 1 & 2 hign pressure injection systems.
Tne attached information is provided in rescense to tnat requested,in the orcer in whicn it was presented.
In summary, both ANO - 1 & 2 have been adeouately designed to maintain hign pressure injection pump cooling during worst case RCS system cressure and flow pressure drcp assumotions.
-QUESTION 1:
In a quantitative manner similar to 1 above, determine wnether or not minimum cooling is provided to centri fugal pumos used for high pmssure injection, for all conditions recuiring SI, prior to satisfying SI termination criteria.
If a " minimum ficw bypass" line is present whicn remains ocen during high pressure injection, and if that line guarantees that minimum cooling ficw will be provided to tne cumos under sucn conditicns, then no furtner calculations are required if all safety related analyses (Item 2.d above) assumed pmsence of the open line.
RESPCNSE:
Cn ANO-1, a quantitative evaluation was done based on actual measured pumo data and the system pressure drop to confirm acceptaci li ty.
This is presented in detail under the Response to Item #3.
s0 121uo /TC veveea weets scum urtmas sys ev
Mr. K. V. Seyfrit, Di rector Septemoer 23, 1980 pressuri:cr coce safety setting of 2500 psig and a worse case system pressure drop of < 100 psig assures 110 psig remaining before a zero flow cead head condition occurs.
Tne Makeuo Pumos require approximately 90 GPM to assure continued operation without overneating.
From the pump curve a flow of approximately 250 GPM would be maintained at 2600 psig pump discharge.
This indicates a large margin of safety for adequate pumo cooling under the maximum RCS system pressure and conservative system pressure drop assumoti ons. Therefore, no roodifications are necessary on either ANO-lor 2 to respond to the concerns addressed in Bulletin 80-18.
Very truly yours, Y
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[-<s David C. Trimle Manager, Licensing CCT:LDY:1p e
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Mr. K. V. Seyfrit, Di rector Septenner 23, 1980 On ANO-2, a minimum flow byrass is provided on the high pressure safety injection pumps that remains open until a Recirculation Actuation SiJnal is present. Since the RCS will be depressurized at this point, no minimum by-pass ficw will be required above the pump disenarge flow ate.
Therefore, no quantative analysis was done on ANO-2 as the design basis has already taken the minimum flow into account.
QUESTION 2:
If availability of minimum cooling flow for the CCPs is not assured for all conditions by the calculations in 1:
a) Make modificaticns to equipment and/or procedures, sucn as those suggested in the enclosure, to insure availability of adequate minimum flow under all conditions.
If modifications are made as described in tne attacnment for interim modification II, verify that the Volume Control Tank Relief Valve is operable and will actuate at its design setpoint.
b) Justify that any manual actions necessary to assure adequate minimum flow for any transient or accident requiring SI can and will be acccmplished in the time necessary.
c) Verify that any manipulations repuired (valve opening or closing, along with the instrumentation necessary to indicate need for the action or accomolishment of the action, etc.) can be accomolished without offsite power available.
d) Justify that flow available from the CCPs with tne modifications in place will be sufficient to justify continued applicability of any safety related analyses which take credit for flow from the CCPs (LOCA, HELS, etc.).
e) Justify that all Tecnnical Specifications based on the Item 2.d analyses remain valid.
RESPONSE-For all cases on ANO-1 & 2, the minimum cooling ficw was detennined to be adequate.
Therefore, no additional response is neede j en Item #2.
QUESTION 3:
Provide the results of calculations performed under Item 1, and describe any modifications made as a result of Item 2 (include the justifications reouested).
RESPONSE
On AN0-1, as discussed previously, the analysis performed indicated the existing situation on the high pressure injection system is acceptable.
This review shows that the lowest actual discharge pressure on the three Makeuo Pumps (HPI Pumps) is 2710 psig, which, when combined wi tn a
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