ML20247N693
| ML20247N693 | |
| Person / Time | |
|---|---|
| Site: | Fort Calhoun  |
| Issue date: | 05/26/1989 |
| From: | Morris K OMAHA PUBLIC POWER DISTRICT |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| LIC-89-516, NUDOCS 8906060004 | |
| Download: ML20247N693 (21) | |
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May 26, 1989 LIC-89-516 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station PI-137 Washington, DC 20555
References:
1.
Docket No. 50-285 2.
Letter from 0 PPD (K. J. Morris) to NRC (P. D. Milano) dated December 21, 1988 Gentlemen:
SUBJECT:
Resolution of Four (4) HED Contained in the Detailed Control Room Design Review Omaha Public Power District (0 PPD) provided in Reference 2 a revised schedule for resolution of the Detailed Control Room Design Review Audit Findings. As part of that correspondence, OPPD committed to resolving HED Nos. 125, 282, 283 and 385 through modification MR-FC-85-146 " Control Room Noise Level" during the 1990 outage. OPPD has reevaluated these HED's and has determined that no action is required in regard to HED Nos. 125, 282, 283 and 385.
Enclosed is the following information providing justification for final resolution to HED Nos. 125, 282, 283 and 385:
"HED Final Resolution"
" Control Room Environmental Sound Survey Final Report" This letter is submitted to document the removal of HED Nos. 125, 282, 283, and 385 as commitments.
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U. S. Nuclear Regulatory Commission LIC-89-516 Page 2.
If you have any questions concerning this matter, do not hesitate to contact Us.
Sincerely,
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. Morr s Division Manager Nuclear Operations KJM/jak c:
LeBoeuf, Lamb, Leiby & MacRae R. D. Martin, NRC Regional Administrator A. Bournia, NRC Project Manager P. H. Harrell, NRC Senior Resident Inspector l
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FORT.CALHOUN STATION DETAILED CONTROL ROOM DESIGN REVIEW HED FINAL RESOLUTION HED No. 125 During the initial Detailed Control Room Design Review (January 1984) a noise survey was conducted. The results of this survey showed that the control room background noise level was approximately 72 dB with peaks up to 94 dB. NUREG 0700, Section 6.1.5.5 recommends that background noise levels not exceed 65 dB. Modification Request MR-FC-85-146 was initiated to correct this human engineering discrepancy.
Since the initiation of this MR and the initial noise survey the control room configuration has changed considerably.
Therefore, another noise survey was-completed 4/19/89. This survey showed that the control room background noise level is 59.6 dB with peaks up to 67 dB (see attached report).
The reduction in noise levels'is attributed to many changes which have occurred in the control room.
1)
Improved Control Room Layout and HVAC system (completed outage 1988) 2)
Limiting Control Room Access (Standing Order 0-11)
- 3) Carpeting the main Control Room (completed spring 1989)
- 4) Replacement. of Control Room Ceiling tiles (completed spring 1987)
Many of the peak noise levels identified in the recent noise survey were attributed to the security equipment located in the control room. As~a'part of the security project, the security equipment and security personnel will be removed from the control room. This will result in further reduction in
. control room noise levels.
The Annunciator upgrade project, MR-FC-87-08, will correct or mitigate human engineering discrepancies involving annunciator noise levels.
Due to the significant reduction in control room noise levels a Human Engineering Discrepancy no longer exists. Modification MR-FC-85-146 is not necessary and will be cancelled.
No further action is required.
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1 FORT CALHOUN STATION DETAILED CONTROL ROOM DESIGN REVIEW HED FINAL RESOLUTION l'
HED NO. 282 See Final Resolution For HED No. 123
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FORT CALHOUN STATION DETAILED CONTROL ROOM DESIGN REVIEW HED FINAL RESOLUTION HED NO. 283 See Final Resolution For HED No.125 1
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FORT CALHOUN STATION DETAILED CONTROL ROOM DESIGN REVIEW HED FINAL RESOLUTION HED NO. 385 See Final Resolution For HED No.125 u___-___-_________.
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^ Attachment 2 l-CONTROL ROOM-ENVIRONMENTAL SOUND SURVEY.
FINAL REPORT PREPARED FOR:
OMAHA PUBLIC POWER DISTRICT FORT CALHOUN l
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4 GP-R-212324R May 3,1989 I
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OPPD Sound Survey Report i
On April 19,1989 General Physics conducted an environmental sound survey of the Omaha Public Power District (OPPD) - Fort Calhoun Nuclear Generating Station's control room. The methodology and results of the survey are described below.
METHODOLOGY Prior to conducting the sound survey at OPPD, a map of the control room was generated. This map was used to pr.eliminarily identify the number of sound level test locations. Once inside the control room, modifications of the test locations could and were made. A total of 26 test locations were identified as being appropriate for sound level mesurments (see Figure 1). Each sound measurement was taken at approximately four to six feet apart and also were conducted in accordance with the specifications identified within NUREG-0700.
Every reading was recorded on a Sound Survey Record form (see Figure 2). The top half of the form identifes the equipment used, the equipment serial number, and the equipments last calibration date. The bottom half of the form allows for the recording of each test location, dB(LIN) measurement, dB(A) measurement, the individual octave band center frequency measurement, and any explanatory remarks.
Each of the test locations were sound tested using the exact same test procedure.
The procedure first involved taking two overall weighted sound level readings and then taking 15 individual octave band center frequency readings. The first of the weighted measurements was an overall dB(LIN) level. The purpose of taking the dB(LIN) reading for each test location was to determine a baseline dB level. This baseline can be used to calibrate future sound readings if dB(B), dB(C), or dB(D) weighted measures are taken.
It must be emphasized that the NUREG-0700 criteria is not based on the dB(LIN) measurement but on the dB(A) reading. Therefore, only the dB(A) readings will be analyzed in this report. All other readings are for information only.
The second overall weighted sound level reading that was taken was the dB(A) level. This reading provides the overall sound level of concern as identified by NUREG-0700. Basically, the dB(A) measurement best correlates between the measured values and the annoyance and disruptability of the sound signal.
The second-half of the procedure involved taking 15 individual octave band center frequency readings. NUREG 0700, Appendix E recommends that five readings be taken between 250 and 4000 Hz. The following 15 frequency readings were taken at each test location (in Hz) providing a more complete survey: 200, 250, 315, 400, 500, 630, 800, 1000,1250,1600, 2000, 3150, 4000, and 5000.
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l The exact procedure used to perform the survey consisted of many steps. This procedure is fully described below:
1.
Calibrated the sound meter by using a 1kHz test tone. The analog meter was adjusted to a 93 dB(LIN) reading and the digital meter indicated a i
reading of 94.2 dB(LIN). The differential of 1.2 dB(LIN) was taken into
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consideration during all measurement readings.
1 2.
Went to the first test location.
3.
Conducted an overall dB(LIN) reading for that location. Recorded the results.
4.
Conducted an overall dB(A) reading for the location. Recorded the results.
5.
Utilizing the frequency filter to obtain the individual readings, measured the dB level at each of the individual frequencies mentioned previously.
Recorded the results.
6.
Recorded any remarks that might have influenced the analysis. These remarks describe any spurious events or equipment conditions that might have temporarily altered the sound measurements (i.e. annunciator alarms or security radio communication).
7.
Went to the next test location.
8.
Repeated steps 3 through 7 above for all 26 test locations RESULTS Upon examination of the Sound Survey Record forms (see Appendix A), the following information is provided:
1.
The dB(A) measurements ranged from 57.1 dB(A) to 67 db(A) with a mean of 59.6 dB(A). Three test locations (3,4, and 10) had readings slightly greater than the NUREG 0700 guideline of 65 dB(A). These readings were 67,66 and 65.2 respectively. These three test locations are not within the primary operating area of the control room and therefore are not within the survey scope required by NUREG 0700 (Ref. Section 6.1.5.5). Testing at these locations was done for information only, i
For the above referenced three test locations, the OSPDS and HVAC systems contributed to the higher dB(A) measurements. In addition, the i
power supply fans located on the back panels, the tile floors and metal walls affected the readings.
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65dB level of acceptability except for one. For test location #3, a dB reading
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of 65.7 was taken at the 315Hz frequency level. Again, the OSPDS and 1
HVAC systems as well as the floor tile and metal wall problem are the focal points for potential causes of this high reading. The remaining frequency levels and test locations were within the acceptable range (according to NUREG-0700).
i CQ_NCLUSIONS Based upon the survey results, the OPPD Fort Calhoun Nuclear Generating Station control room decreased its overall dB(A) level from 72 dB(A) with peaks to 94 dB(A) in 1984 to 59.6 dB(A) with peaks to 67 dB(A). This substantial improvement is due primarily to the carpeting of the floors and the tiling of the ceiling.
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