ML20041E157
| ML20041E157 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 03/02/1982 |
| From: | Schnell D UNION ELECTRIC CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML20041E159 | List: |
| References | |
| RTR-NUREG-0830, RTR-NUREG-830 ULNRC-546, NUDOCS 8203100203 | |
| Download: ML20041E157 (4) | |
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/ UNION ELECTRIC COMPdNY 1901 GRATIOT saTREET ST. Louis. MissouR DONALO fr. eCHNELL ggo g a vesE ensseoswt er. Louse heessouses estee Mr. Harold R.
Denton Director of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission ULNRC-546 Washington, D.C.
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Dear Mr. Denton:
ll 4K3 DOCKET NUMBER 50-483 gy 3 2
CALLAWAY PLANT, UNIT 1 4
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ICE LOAD ANALYSIS FOR ESW SYSTEM 'u QC Ya g,W Q)
Ref: NUREG-0830, Callaway Safety Evaluation 9p,or't
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The referenced report states in Sections 1.7 an
.4.4 that the NRC Staff is not satisfied with the analysis of ice thrust forces on the essential service water system (ESWS) intake and outlet structures.
The basis for the analysis is described in the Callaway FSAR Site Addendum Section 3.8.4.3.1, Table 3.8-2 and in response to NRC question 240.4C.
A 100-year ice thickness was combined with a safe shutdown earthquake and a combination of loads from many other postulated severe conditions to assure adequate design of the ESWS.
The referenced report states that a 25 year, ice thickness should be combined with other e::treme environmental events such as an SSE.
We feel the criteria we have already used is at least as conservative as that criteria proposed by the NRC.
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The original calculation used mean monthly temperatures
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for December, January, and February to determine ice thickness.
The referenced report states that the Staff does not consider this method to be conservative.
It is unde' stood that the NRC Staff prefers daily mean temperatures to be used.
In addition the Staff reported that upper limit ice forces (i.e. probable (yC)f maximum ice) should be considered.
The attached raport is a summary of calculations performed for the Callaway retention pond.
The 25-year ice thickness and forces were calculated.
In addition, the forces t l from the probable maximum ice were calculated.
The recurrence interval of degree days used is based on daily average temperatures.
Based on the application of ice loads calculated in the attached report, it has been determined that the ESW pump house structure is capable of wi thstanding the ice thrust loads associated with the probable maximum ice condition and remaining within design allowables.
In addition, the ESW pump house t
8203100203 820302 PDR ADOCK 05000483 E
ULNRC-Page 2 structure is capable of withstanding the combined loads resulting from the 25 year recurring ice condition and an SSE and remain within design allowables.
Note that the 2.4 ksf for 24 inches of ice described in the FSAR equates to 4.8 kips per linear foot (the units used in the attached report).
If the NRC needs further information to resolve this issue, please let us know.
Very truly yours, p
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F.
Schnell DS/ mal
Attachment:
Ultimate Heat Sink Retention Pond 25-year and Probable Maximum Ice Forces, Summary Report.
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STATE OF MISSOURI )
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Donald F.
Schnell, of lawful age, being first duly sworn upon oath says that he is_Vice President-Nuclear and an officer of Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full power and authority to do co; and that the facts therein stated are true and correct to the best of his knowledge, information and belief.
By
,wY Donald F.' Schnell Vice President Nuclear SUBSCRIBED and sworn to before me this 2nd day of March, 1982 AM 0 l4 V
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BARBARA J. PFAFF NOTARY FUBLIC, STATE OF MISSOURI MY COMMISSION EXPIRES APElt 27,15S5 ST. LOUIS COUNTY j
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cc:
Glenn L.
Koester Vice President Operations Kansas Gas & Electric P.O.
Box 208 Wichita, Kansas 67201 John E.
Arthur Chief Engineer Rochester Gas & Electric Company 89 East Avenue Rochester, New York 14649 A.
V.
Dienhart Vice President Plant Engineering and Construction Northern States Power 414 Nicollet Mall Minneapolis, Minnesota 55401 Donald T. McPhee j-Vice President Kansas City Power and Light Company 1330 Baltimore Avenue Kansas City, Missouri 64141 Gerald Charnoff, Esq.
Shaw, Pittman, Potts & Trowbridge 1800 M.
- Street, N.W.
Washington, D.C.
20036 Nicholas A.
Petrick Executive Director SNUPPS 5 Choke Cherry Road Rockville, Maryland-20850 John H.
Neisler Callaway Resident Office U.S.
Nuclear Regulatory Commission RR#1 i
Steedman, Missouri 65077 i
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