IR 05000456/1986033
| ML20212A245 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 07/21/1986 |
| From: | Falevits Z NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML20212A237 | List: |
| References | |
| 50-456-86-33, 50-457-86-25, NUDOCS 8607280146 | |
| Download: ML20212A245 (5) | |
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U. S. NUCLEAR REGULATORY COMMISSION
REGION III
Reports No.: 50-456/86033(DRS);50-457/86025(DRS)
Docket Nos.: 50-456; 50-457 Construction Permits No. CPPR-132 and No. CPPR-133 Licensee: Commonwealth Edison Company Post Office Box 767 Chicago, IL 60690 Facility Name: Braidwood Station, Units 1 and 2 Inspection At: Braidwood Site, Braidwood, IL Inspection Conducted: June 24 through July 14, 1986
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Inspector:
Z. Falevits
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I Approved By:
J. W. Muffett, Chief Plant Systems Section
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Inspection Summary n
JDR J Inspection _on June JRepor_t Nos._ _50-_45_6/86033, _S ;
A~reas /8602TJlfRS) __2,4 _26_ and_Ju_1y__14, 1986
~ e 50-457 inspec_ted: Routine, unannounced inspection of licensee actions on j
previous inspection findings; review of surveillance results on RWRs; and inspection of electrical activities.
Results: Of the three areas inspected, no violations or deviations were
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identiffed.
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DETAILS 1.
Persons Contacted
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C onno nwe a l _th_ E_d i_s_on_ _C_omp a ny__(_C E_ Cpl M. J. Wallace, Proiect Manager E. E. Fitzpatrick, Station Manager D. L. Shamblin, Construction Superintendent C. J. Tomashek, Startup Superintendent G. F. Marcus, Assistant to Manager, QA D. E. Paquette, Assistant Superintendent C. W. Schroeder, Services Superintendent
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R. D. Kyrovac, Station QA Supervisor McLean Takaki, Station QA Supervisor
- P. L. Barnes, Regulatory Assurance Supervisor A. J. D' Antonio, Regulatory Assurance Supervisor T. W. Simpkin, Regulatory Assurance Supervisor T. F. Phielan, PFE - Electrical Supervisor U. S. Nuclear _ Regula_tp_ry__C_onn_is_sion__(NRQ o
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T. Tongue, Senior Resident Inspector, Operations W. Kropp, Senior Resident Inspector, Construction T. Taylor, Resident Inspector The inspector also contacted and interviewed other licensee and contractor personnel.
- Denotes those attending the telephone exit interview on July 14, 1986.
ki ppspp_ AS_tjon_pn_ P_rpyj_ou_s, Insppc_ tion Findings 2.
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a.
(closed) Open Item (456/85028-01; 85028-01): The inspector previously observed that a 1 PR #16AWG shielded twisted pair cable carrying instrumentation signal, and a 1/c #10AWG cable designated as type "K" (instrumentation type segregation code) used for the grounding input of the 120V AC feed to the RM-80 unit, had been pulled through the same conduit. The licensee discussed the above observation with G. A. Technologies (the Vendor) and determined that the routing of the 120V AC power supply cable in the same conduit as those used for instrumentation could possibly cause electrical noise coupling from the power cable to the signal line (reference Sorreto Electric letter to S&L dated June 14,1985); however, in a subsequent letter dated December 19, 1985, the vendor estimated that such noise would be negligible.
This was based on the fact that the load connected to the #16AWG power supply cable is approximately 50 ma, and that the AC pcwer wiring is grounded. The 0-SV DC signal wiring is shielded and the power wire ground signal is grounded internally. Regarding part (c) of the original open item, the licensee indicated that the applicable schematic diagram will be revised to include TB1-9 to
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assure that the schematic conforms to the field installation and the applicable connection diagram. The inspector has no further concerns relating to this item.
b.
(Closed) OpenItem(456/85028-02;85028-02): The inspector previously identifieu various instances where three lugs have been placed on a single terminal in Diesel Generator control panel 1PLO7J, and in Process Radiation relay panels 1RT-PR030. This is contrary to CECO wiring standard C-2325, item IV-12. CECO review of the reported terminations revealed that the terminal screws have sufficient thread length to provide good electrical contact and preclude any loose terminations. The licensee indicated that since standard C-2325 was included in the procurement specifications for the inspected vendor equipment, this violation of the procurement specifications was discussed with both G. A. Technologies and Cooper Energy Services who stated that the installed condition, although in conflict with S8L specifications, is their generic design supported by qualification testing. These responses are satisfactory to close this issue.
c.
(Closed) Open Item (456/85028-03, A8B; 457/85028-03, A&B): During a previous inspection, the inspector reviewed the licensee's resolution to the excessive voltage drop condition associated with the control rocm chiller system. Ceco startup testing found that on remote starting of the safety-related control room chillers, the safety circuit relays chattered due to a low voltage condition preventing the chillers from starting.
FieldChangeRequest(FCR)L-18472 was issued to initiate action to make minor schematic and wiring changes to use existing spare conductors to reduce the voltage drop. The corrective action taken resulted in doubling of some of the conductors in the chiller circuitry. No voltage drop calculation or analysis was performed by the licensee, as required due to the unusual length of the B chiller circuit (3,100 feet). On June 7, 1985, the inspector requested that Chillers A and B be tested to determine if the corrective action taken by the licensee to resolve the voltage drop problem was adequate. During the test of Chiller "A", relays were noted to be chattering and flickering of lights were observed.
The licensee attempted to run two tests on Chiller "B", but during both tests, the chiller failed to start, excessive relay chatter was noted and the relays failed to pick up the signal.
Subsequently, S8L has perfonned a formal calculation (4391/19AQ-41)
to evaluate the control panel OW001CA-C/0W001CB-C voltage drop problems. The inspector reviewed the calculation which included the minimum pickup voltages for the various electrical devices within the panels and the voltage drops for each circuit, and found it to be comprehensive in addressing this problem. Based on the results of this calculation, the licensee has implemented several changes to the chillers' starting circuitry (reference design change WO-42).
These changes consisted of replacing several circuit conductors with larger sizes, and the re-wiring of the control panels for the addition of an interposing relay. Deficiency numbers WO-10-118 and WO-10-119, dated May 2,1985, were issued docun,enting the corrective
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action taken and the functional test perfonned to assure that the chillers started properly without relay chattering. The inspector, accompanied by the licensee's system engineer, perfonned a field to Chiller "B" panel (0W001CB-C)quacy of the licensee's modifications inspection to determine the ade The chiller modification was
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accomplished in accordance with the applicable design drawing requirements. During this inspection the inspector observed the following related items:
(1) The white / black conductor and the red / black conductor of cable IW0029 were found terminated at points L2 and 11 respectively, but were not shown on the connection diagram.
(2) Terminal point 32 on the panel contained only one conductor on the bottom side of the terminal block while the connection diagram indicated two conductors termination to point 32.
(3) The panel door could not be opened mo'e than approximately 15" making it irrpossible to reach the lef half of this panel. At the same time, the door would not cic,e shut due to the newly pulled cable which was leaning agains. the internal devices mounted on the door.
The licensee indicated that corrective action will be initiated to resolve the above matter. The licensee's responte and modifications are satisfactory to close this issue.
d.
(Closed) OpenItem(456/85028-04;457/85028-04): During a previous inspection, the inspector identified inconsistencies noted on the schematic and wiring diagrams associated with the control room refrigeration units A and B.
Subsequently, S&L has generated design change SX-059 which revised drawings 20E-0-4030 WO34 and 20E-0-4030 WO36 and corrected the inconsistencies identified. The inspector reviewed the drawings and found them acceptable to close this item.
Re v i ew o f_ Rev i sj onf Work __Re_qu e s t_1RWRJ_ I mp,l eme n_t a_tj o n 3.
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On March 6,1986, the inspector conducted a document and field visual inspection to ascertain the licensee's implementation of revisions to design drawings. During this review the inspector noted that MCC 131X1 compartment B4, and valve ICS001A limit switch contact 14-14C contained terminated conductors contrary to the requirements of the applicable design drawings (for details see violation 456/86015-01).
Further review indicated that L. K. Comstock procedure 4.3.16 entitled " Revision /
Work Request of All Electrical Equipment," was deficient in that it did not require that L. K. Comstock engineers initiate RWRs for all revised drawings delineating field external connection changes. Subsequent to the inspector's finding, and in response to the violation, the licensee conducted internal surveillance S-086-11 to determine the extent of the RWR highlighting program deficiencies. Surveillance results as docunented in L. K. Comstock's memorandum C86-06-67 dated June 19, 1986, indicated numerous discrepancies existed, and that there is an " obvious need to walkdown and baseline all the safety-related electrical wiring diagram,"
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to assure as-built condition of the plant is reflected on the design drawings. During this inspection, the inspector reviewed the progress of this program and examined L. K. Comstock findings as documented on the following electrical drawings: 20E-1-4126D, 20E-0-4473D, 20E-4466E, 20E-1-45390, 20E-0-4480, 20E-1-4256C, 20E-0-4474A and 20E-1-4105A.
Typical surveillance findings discovered by the licensee were as follows:
Wiring highlighted not installed and installed wiring not highlighted.
- Devices and wiring include n; ore wiring than shown for installed
not highlighted.
Wiring not installed per drawing or installed but not on drawing.
- Labels installed not highlighted.
- All devices installed not highlighted.
- The licensee informed the inspector that a comprehensive ' effort is being initiated to walkdown the safety-related systems to resolve this issue.
This activity will be reviewed by the NRC during future inspections as part of the process to close the original violation.
Oyen Items Open items are matters which have been discussed with the licensee, which will be reviewed further by the inspector and which involves some action on the part of the NRC or licensee or both. An open item disclosed during this inspection is discussed in Paragraph 2.
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Exit Interview The inspector met with a licensee representative (denoted in Paragraph 1)
at the conclusion of the inspection on July 14, 1986. The inspector sunmarized the scope and findings of the inspection noted in this report.
The inspector also discussed the likely informational content of this inspection report with regard to docun.ents or processes reviewed by the inspector during this inspection. The licensee did not identify any such documents / processes as proprietary.
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