ML19253B759
| ML19253B759 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 09/10/1979 |
| From: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| NUDOCS 7910220195 | |
| Download: ML19253B759 (6) | |
Text
a b
CONNECTICUT YANKEE ATOMIC POWER COMPANY BERLIN. CONNECTICUT P. 6 BOX 270 H ARTFORD. CONN ECTICUT 08101 Tuermons 203 6 e s 6911 September 10, 1979 Docket No. 50-213 Mr. Boyce H. Grier, Director Region I Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, PA 19406
Reference:
(1)
B. H. Grier letter to W. G. Counsil dated July 11, 1979 forwarding 1&E Bulletin No. 79-15.
Gentlemen:
Haddam Neck Plant Deep Draft Pump Deficiencies I&E Bulletin No. 79-15, Reference (1), requested that Connecticut Yankee Atomic Power Company (CYAPCO) identify any deep draf t pumps at the Haddam Neck Plant which are similar to those described in Reference (1) and provide specific information with regard to those pumps. The NRC Staff requested that this information be provided within 60 days of the date of Reference (1).
Accordingly, CYAPC0 hereby provides the attached information in response to the NRC Staff requests.
In addition, Reference (1) requested that CYAPCO accumulate and make available for inspection at the Haddam Neck Plant site other specific items of information with regard to the identified pumps.
All documentation requested is presently available at the plant site, with one exception.
No comparison of replacement frequency with manufacturers' rated life for wearing surfaces was performed. Rated life was not specified in the design specifications or by the manufacturers.
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In addition, all safety-related pumps at the Haddam Neck Plant are presently being inspected and tested under the provisions of ASME Section XI, Subsection IWP within the Haddam Neck ISI/IST Program.
CYAPC0 trusts that this information is responsive to NRC Staff requests.
Very truly yours, CONNECTICUT YANKEE ATOMIC POWER COMPANY Tufl.
4.~ G. Counsil Vice President Attachment 1149 066
DOCKET NO. 50-213 ATTACHMENT HADDAM NECK PLANT RESPONSE TO I&E BULLETIN No. 79-15 1149 067 SEPTEMBER, 1979
CONNECTICUT YA NKEE 1.
Connecticut Yankee utilizes four (4) deep draft pumps in safety related applications similar to the one shown in Figure 1 of Reference 1.
2.
The pumps were manufactured by Worthington Corporation, Model No. 24H-590, and have a design point of six thousand (6,000) gpm a t 150 ft. TDH.
The pumps provide normal and emergency
<2ation service water to safety and nonsafety related heat exchangers.
The pump mark numbers are P-3 7_-1 A, P-37-1Br P-37-lC, and P-37-lD.
3.
The pump colums are thirty-two feet (32') long and thirteen and one-quarter i.n : h e s (13k") in diameter.
The above-grade discharge is sixteen inches (16").
i.
General:
(a)
Storage and installation were performed in accordance with manufacturer's instructions.
(b)
No initial alignment problems occurred.
(c)
Startup testing did non reveal any significant problems.
(d)
No routine test ng or maintena nce program wa s followed prior to 1975 at which time an overhaul was conducted on pumps P-37-1Ar P-37-1B and P-37-lc.
Specific:
P-37-1A:
(a)
Startup date Septemt2r 1966 (b)
Pump overhaul in NotemLer 1975 which involved replacement of bearings and impclier and casing wear rings.
P-37-1B:
(a)
Startup date September 1966.
(b)
Pump overhaul in April 1975 which involved replanement of bearings and impeller and casing wear rings.
(c)
The bearings were replaced during an overhaul in Ncvember 1976.
(d)
Pump overhaul in September 1978 which involved replacement of impeller and casing wear rings and repair of the impeller which showed signs of normal wear.
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CONNECTICUT YANKEE
~2-P-37-lC:
(a)
Startup date September 1966 (b)
Pump overhaul in January 1976 which involved replacement of bearings and impeller and casing wuar rings.
(c)
Pump overhaul in November 1978, which involved replacing casing wear rings and refurbishing the impeller which showed signs or excessive wear.
P-37-lD:
(a)
Startup date September 1966.
(b)
Pump overhaul in April 1977, which involved replaccmont of the impeller and impoller and casing wear rings.
The shaft required minor straightening.
(c)
In March 1978 the pump was inspected due to a noisc in the discharge flange area.
The pump exhibited normal wear.
However, the second stage bearing ws not equipped with "O"
ring grooves and no "O"
rings were installed.
A new bearing equipped wi t h "O"
rings was installed, and the pump sa tisfac to ril y returned to service.
5.
General:
The pump overhaul performed in 1975 was instig tad by an overall degradation in capacity and head.
In general, the impollers, diffusers, and waaring surfaces showed above-average wear.
However, due to the long interval from startup to overhaul, this wear is not considered abnormal.
6.
(a)
The longest interval that each pump has been available for op era ti on without corrective maintenance:
P-37-1A, approximately nine (9) years.
P-37-1B, approximately eight and ana-hal f (84) years.
P-37-1C, approximately cight (8) years.
P-37-lD, approximately ten and one-half (10b) years.
(b)
Identify the number of cycles of operation during this interval.
(c)
The duration of each cycle and the opera ting modc (s).
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CONNECTICUT YANKEE Response to (b) and (c) cannot be obtained.
The cycli c operation of pumps is dictated by seasonal changes and plant operating modes.
Detailed records of pump cycles are not maintained.
(d)
Identify the longest continuous operation at or near rated flow conditions for each pump and status of the pump oper-ability at the end of the run.
Mark No.
Operation (Hours)
Status P-37-1A Approximately 50,000 Item 5 P-37-1B Approximately 45,000 Itcm 5 P-37-lc Approximately 45,000 Item 5 P-37-lD Approximately 45,000 Item 5 Due to systcm operating characteristics, the pumps are run between 23% and 73% of rated flow.
Therefore, the above data is not for operation at or reasonably near rated flow.
In all cases, the pumps are o,"erated above minimum flow.
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