IR 05000373/1979039
| ML19211C995 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 12/03/1979 |
| From: | Barrett P, Hayes D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML19211C992 | List: |
| References | |
| 50-373-79-39, NUDOCS 8001160086 | |
| Download: ML19211C995 (5) | |
Text
.
.
U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT
REGION III
Report No. 50-373/79-39 Docket No. 50-373 License No. CPPR-99 Licensee:
Commonwealth Edison Company Post Office Box 767 Chicago, IL 60690 Facility Name: La Salle County Station, Unit 1 Inspection at: La Salle Site, Marseilles, IL Inspection Conducted: October 20, 30 and 31, 1979
[6.8u,
//Je/7f Inspector:
P. A. Barrett Approved By:
a s if
/ 7-
/79 Engineering Support Section 1 Inspection Summary Inspection on October 20, 30 and 31, 1979 (Report No. 50-373/79-39)
Areas Inspected:
Licensee action on previously identified items. Control of cable raceway fill. Electrical equipment sizing. This inspection involved a total of 17 laspector hours by one NRC inspector.
Results: No items of noncompliance or deviations were identified during this inspection.
1756 294
.
Ob i
8001160
-
.
DETAILS
.
Persons Contacted Principal Licensee Personnel
- G. F. Marcus, Director of Quality Assurance
- E. L. Martin, Quality Assurance Coordinator
- R.P. Joyce, Senior Engineer, SNED D. Spencer, Quality Assurance Engineer Architect Engineering Personnel
- W.
G. Schwartz, Senior Electrical Project Engineer
- R. M. Schiavoni, Electrical Project Engineer
- J. E. McFarland, Quality Assurance Division Head
- A.
P. Gillis, Senior Quality Assurance Coordinator
- L. P. Dolder, Quality Assurance Coordinator Licensee Action on Previously Identified Items (Closed) Noncompliance (373/79-13-02): Failure to specify bolting materials to be used for cable terminations on Class IE motors. The RIII inspector reviewed a listing cowpiled by H. P. Foley Electric Company. This list identified all of the Class IE power terminations. On October 20, 1979, the RIII inspector observed retermination activities for cables #1FC-021,
- 1DG-030, #1DG-012, and #1FC-022. The reterminations were made in accordance with instruction HPFCo-WI-500 Rev. 7; a letter from K. W..Steele, CECO to R. Ouzts, H. P. Foley Company dated October 8, 1979; CECO standard #EM-51308; and CECO standard C849. The replaced fastening materials did not comply with these identified requirements. The licensee's representative indicated that all of the Class IE power terminations either have been or will be completed and verified in accordance with the above requirements.
(0 pen) Unresolved Item (373/79-34-01): Apparent discrepancies of four extra cables in tray 1062B and eight extra cables in tray 250C, which were not listed on the Cable Pan Loading Report dated August 24, 1979, were identified.
The licensee has since researched the discrepancies and stated that cables 1RF055, 1RE036, and 1RH093 in tray 1062B were inadvertently not listed on the Loading Report; cable 1FP389 was added to tray 1062B after the publication of the August 24, 1979 Loading Report; and seven cables (Nos. 1RE087, 1AN024, 1AN021, 1AN026, 1AN035, 1AN037, and 1AN042) in tray 250C were replaced or deleted before the originally installed cables had been removed. The licensee has not accounted for the eighth extra cable in tray 250C. The licensee indicated that a Field Change Request was being issued to cover the problem of cables being inadvertently missed on the Cable Pan Loaoing Report.
.
1756 295-2-
i One associated (nonsafety related) control cable had been misrouted from the scheduled conduit through an adjacent conduit. Associated cables have
'
been partially routed with safety related cables or otherwise influence safety related systems. The Architect Engineer's, AE, representative indicated that there were no inherent design mechanisms to prevent and/or identify misrouted cables. On November 13, 1979, during a phone conversation, the licensee indicated that there have been no quality control inspection requirements for associated cable routings. Therefore, the potential exists for safety related raceways to be filled with more cables than designed. This could lead to excessive thermal loads in raceways containing power cables.
On November 15, 1979 the licensee stated that a thorough audit and surveil-lance program has been initiated to assess the impact of noninspected asso-ciated cable routings on safety related systems (including thermal loading).
This program will be reviewed during a subsequent inspection.
The AE stated that design calculations will be performed to assure that the dead-weight loading requirements have not been exceeded for tray 1062B; tray 250C; tray intersection 225C, 235C, 249C, and 224C; and the worst case raceway load, as identified by the AE.
The calculations will be forwarded to the NRC Region III.
A review of additional cable raceway fill controls is addressed in the details of this report.
-
Functional or Program Areas Inspected 1.
Control of Cable Raceway Fill On October 30, 1979 the RIII inspector discussed and reviewed the measures established by Sargent & Lundy to control the thermal (ampacity)
loading of raceways. The measures included control of thermal loading of all safety related conduits on a conduit by conduit basis in accordance with the National Electric Code; extensive conservatism to preclude thermal overloading of control raceway; and an indication system (design index)
to flag all trays which have potentially been thermally overfilled and do not comply with IPCEA Publication Number P-54-440 (Second Edition)
dated May 12, 1975. The following documents describe these measures:
a.
S&L Standard EDSB-10 dated May 7, 1975 (Electrical Drafting Reference For Determining Conduit & Electrical Duct Sizes)
b.
S&L Reference ESA-104a dated June 17, 1974 (Proposed Revision to Electrical Engineering Reference For Current Carrying Capacities of Copper and Aluminum Cables)
c.
S&L Standard STD-EB-741 (Straight Cable Tray Cross Section l'-0" offset)
d.
Tables listing the La Salle County Station Cable Ampacities, dated April 2, 1975.
1756 296-3-
e.
S&L Instruction PI-LS-14 Rev. O dated March 13, 1978 (Cable
,
Tray Loading Design Indexes)
The above documents address the design index concept, but do not define the controlling link between the apparent arbitrary design index scale and IPCEA Publication P-54-440 or the National Electric Code. The licensee stated that the link was a design index of 1.0 equating to a calculated cable depth of two inches as indicated in IPCEA P-54-440, which does not address conduits. The RIII inspector realized these concerns during a review of the above documents after the inspection period. The licensee was informed of the concerns on November 13, 1979.
These matters are unresolved and will be reviewed during a subsequent inspection.
(373/79-39-01)
The AE stated that design calculations for power raceway, which have been indentified by the design index scale as potentially nonconforming, will be performed near the completion of La Salle Unit 1.
This timing will allow verification of the final (as-built) conditions. The licensee indicated that the NRC RIII will be notified when these calculations are completed.
(373/79-39-02)
No items of nontampliance were identified.
2.
Electrical Equipment Sizing On October 31, 1979, the RIII inspector reviewed and discussed the sizing of the following interconnected electrical equipment and components:
a.
Nonsegregated bus connecting diesel generator lA to 4160 volt switchgear bus 142Y.
The bus was sized according to the diesel generator output of approximately 413 amps. Per H. K. Porter Company drawing #U-122216 sheet 2 of 7 revision 7, the bus is rated at 1200 amps.
b.
4160 volt switchgear 142Y cubical 9 circuit breaker. The designed load was 480 volt switchgear 136X which had a maximum indicated load of 1333 KVA (192 amps) per S&L loading sketch No. ES-3 sheet 14 of 62 revised April 25, 1977. Per ITE drawing
- 33-50080-Ez9 revision 6, the breaker is rated at 1200 amps.
c.
Cable #1AP168 (3/C, 250 MCM, SKV) connecting 4160 switchgear 142Y cubical 9 to 480 volt switchgear 136X (IAP21E).
The maximum designed load for the cable draws 192 amps.
The cable manufacturer (Kerite) rates the cable at 323 amps.
.
1756 297-4-
.
.
d.
480 volt switchgear 136X breaker 304C.
The maximum designed load draws 275.77 amps, per S&L loading sketch No. ES-3 sheet 57 of 62 revised April 25, 1977. Per specification J-2546 the General Electric breaker is rated at 600 amps.
e.
Cable 1AP332 (3/C, 500 MCM, 600V) connecting 480 volt switchgear 136X breaker 304C to 480 volt motor control center 136X-2.
The maximum designed loads draw 275.77 amps. The cable manufacturer (Okonite) rates the cable at 391 amps.
f.
Cable IDG054 (3/C, #14, 600V) connecting 480 volt MCC 136X-2 compartment C1 to a diesel generator oil circulation pump motor.
The one horsepower motor draws less than 2 amps. The cable manufacturer (Okonite) rates the cable at 7.5 amps.
g.
CableIRH016(3/C,31/0,SKV) connecting 4160voltswitch-gear 142Y cubical 4 to residual heat removal pump motor B.
The 800 horsepower motor draws a full load current of 105 amps.
The cable manufacturer (Kerite) rates the the cable at 162 amps.
The AE indicated that a short circuit analysis for all safety related electrical circuits will be performed near the completion of Unit 1.
No items of noncompliance were identified.
Unresolved Matters Unresolved matters are matters about which more infermation is eequired in order to ascertain whether they are acceptable items, items of noncompliance or deviations. An unresolved item disclosed during this inspection is dis-cussed in Paragraph 1.
Exit Interview The inspector met with licensee representatives on October 31, 1979. The inspector summarized the scope and findings of the inspection. The licensee acknowledged the findings as reported.
,
1756 298-5-