ML14057A851
| ML14057A851 | |
| Person / Time | |
|---|---|
| Site: | Pilgrim |
| Issue date: | 01/31/2014 |
| From: | Lobo W Entergy Nuclear Operations |
| To: | Nadiyah Morgan Division of Operating Reactor Licensing |
| References | |
| Download: ML14057A851 (7) | |
Text
NRR-PMDAPEm Resource From: Lobo, Walter [wlobo@entergy.com]
Sent: Friday, January 31, 2014 11:24 AM To: Morgan, Nadiyah
Subject:
FW: Response Requested: Pilgrim Relief Request No. PR-03, revision 4 (ML12342A386)
Attachments: Email Clarification for January 30 - NRC Staff Question.docx Importance: High
- Dee, Clarification is attached on our prior submittal.
If the clarification resolves the issue, excellent.
If a call is needed, we will have it next week.
Thank you for the support.
Walter Lobo From: Morgan, Nadiyah [1]
Sent: Thursday, January 30, 2014 4:11 PM To: Lobo, Walter
Subject:
Response Requested: Pilgrim Relief Request No. PR-03, revision 4 (ML12342A386)
Importance: High
- Walt, I think that the reviewer would like to schedule a quick phone call. But if you can address this through email, that should be fine.
- Thanks, Dee From: Bedi, Gurjendra Sent: Thursday, January 30, 2014 4:06 PM To: Morgan, Nadiyah Cc: Bedi, Gurjendra
Subject:
Pligrim Relief Request No. PR-03, revision 4 (ML12342A386)
Importance: High Dee Pilgrim is requested to provide an clarification about wordings and table 1 of the Relief Request PR-03 as follows:
Third paragraph on page 100 of 174 states that An significant conclusion of the PNPS HPCI vibration evaluation is that supplemental performance monitoring of the Main pump, by disregarding the single frequency component caused by the excitation at 4x Booster pump RPM, provides an important tool for assessing and trending pump mechanical condition. A single peak frequency component can be effectively deleted from a vibration spectrum using the mean-squared subtraction method; that is, the discrete component amplitude (in./sec.
peak) is squared and subtracted from the spectrum overall level squared, then the square root of that difference represents the overall vibration level that exists without the energy contributed by the deleted component. It has been found that when this method is used, the remaining overall vibration level is much more consistent, stable, and trendable.
1
Second paragraph on Page 103 of 174 states that The table below provides the acceptance criteria that are applied to the overall vibration level for the Main pump. The note explains that for the horizontal Main pump points, the discrete frequency components at 4x Booster pump RPM will be extracted from the overall value using the mean-squared subtraction method. The modified (corrected) overall values (points P3H and P4H) resulting from the extraction of the discrete peak at 4xBooster pump RPM will be reviewed separately for change, and trended as a supplemental vibration performance monitoring activity.
Table Main Pump on page 104 of 175 states:
Table-1, Main Pump**
Test Vibration Point Proposed Proposed Alert Range Required Parameter Acceptable Range Action Limit (Note 2)**
Vv Main pump (Note 1.1Vr >1.1 Vr to 1.3 Vr >1.3 Vr 1)** Horizontal but not or or Inboard (P3H) >1.06 in/sec >1.06 to 1.26 in/sec >1.26 in/sec Vv Main pump (Note 1.1Vr >1.5 Vr to 6 Vr >1.3 Vr 1)** Horizontal but not or or Outboard (P4H) >0.700 in/sec >0.700 to 0.83 in/sec >0.83 in/sec Vv Main pump 1.5Vr >1.5 Vr to 6 Vr >6 Vr Vertical Inboard but not or or (P3V) >0.450 in/sec >0.450 to 0.70 in/sec >0.70 in/sec Vv Main pump 2.5Vr >2.5 Vr to 6 Vr >6 Vr Vertical Outboard but not or Or (P4V) >0.325 in/sec >0.325 to 0.70 in/sec >0.70 in/sec Vv Main pump 1.5Vr >1.5 Vr to 6 Vr >6 Vr Axial Inboard but not or or (P3A) >0.500 in/sec >0.500 to 0.70 in/sec >0.70 in/sec Notes:
- 1. ** For the main pump horizontal vibration points P3H and P4H, a frequency spectrum analysis will be performed following each pump vibration operability test, and the discrete peak at 4x booster pump (4xBP) RPM will be extracted (using the mean-squared subtraction method) from the vibration spectrum overall value. In addition to the Alert and Required Action limits, the modified P3H and P4H overall values, resulting from the extraction of the discrete peak at 4xBP RPM, will be reviewed and trended as a supplemental vibration performance monitoring activity.
Question for Pilgrim, please explain the following All the wording in above paragraphs says that discrete peak will be extracted (filtered), whereas the values shown in table all full values (unfiltered) without any extraction. Or NRC staff is missing anything.
Thank you G. S. Bedi From: Morgan, Nadiyah Sent: Thursday, January 30, 2014 3:11 PM To: Bedi, Gurjendra
Subject:
I'm on the phone with Pilgrim right now.
2
Nadiyah S. Morgan Calvert Cliffs and Pilgrim Project Manager, NRR US Nuclear Regulatory Commission O-8F4 (301) 415-1016 Nadiyah.Morgan@NRC.GOV 3
Hearing Identifier: NRR_PMDA Email Number: 1121 Mail Envelope Properties (B237F4B35BE59849A53A9CCF00ADB84444304EAE)
Subject:
FW: Response Requested: Pilgrim Relief Request No. PR-03, revision 4 (ML12342A386)
Sent Date: 1/31/2014 11:24:23 AM Received Date: 1/31/2014 11:24:28 AM From: Lobo, Walter Created By: wlobo@entergy.com Recipients:
"Morgan, Nadiyah" <Nadiyah.Morgan@nrc.gov>
Tracking Status: None Post Office: LITXMETSP003.etrsouth.corp.entergy.com Files Size Date & Time MESSAGE 4847 1/31/2014 11:24:28 AM Email Clarification for January 30 - NRC Staff Question.docx 20323 Options Priority: High Return Notification: No Reply Requested: No Sensitivity: Normal Expiration Date:
Recipients Received:
Attachment for Email Clarification to January 30, 2014 - NRC Staff Question Question for Pilgrim, please explain the following All the wording in above paragraphs says that discrete peak will be extracted (filtered), whereas the values shown in table all full values (unfiltered) without any extraction. Or NRC staff is missing anything.
Thank you G. S. Bedi Pilgrim Response:
- 1) You understand correctly that the values shown in Table 1 (Table Main Pump on page 104 of 175) are all full values (unfiltered) without any extraction of the discrete vibration peak.
The limits in Table 1 will be used as the OM Code Acceptable, Alert, and Required Action values.
- 2) The intention of Second paragraph on Page 103 of 174, and Note 1 on Table 1, is to identify that Pilgrim will administratively conduct an additional (supplemental) performance monitoring activity as follows:
In addition to the OM Code vibration monitoring as specified in Table 1, administrative (supplemental) vibration performance monitoring will also be performed by Pilgrim.
The supplemental performance monitoring activity will look at the modified (filtered) overall values (for points P3H and P4H) resulting from the extraction of the discrete peak at 4xBooster pump RPM (using the mean-squared subtraction method). The modified (corrected/filtered) overall values for points P3H and P4H will reviewed (in addition to the OM Code specified vibration monitoring) separately for change and trended.
NRC Request:
Pilgrim is requested to provide an clarification about wordings and table 1 of the Relief Request PR-03 as follows:
Third paragraph on page 100 of 174 states that An significant conclusion of the PNPS HPCI vibration evaluation is that supplemental performance monitoring of the Main pump, by disregarding the single frequency component caused by the excitation at 4x Booster pump RPM, provides an important tool for assessing and trending pump mechanical
condition. A single peak frequency component can be effectively deleted from a vibration spectrum using the mean-squared subtraction method; that is, the discrete component amplitude (in./sec. peak) is squared and subtracted from the spectrum overall level squared, then the square root of that difference represents the overall vibration level that exists without the energy contributed by the deleted component. It has been found that when this method is used, the remaining overall vibration level is much more consistent, stable, and trendable.
Second paragraph on Page 103 of 174 states that The table below provides the acceptance criteria that are applied to the overall vibration level for the Main pump. The note explains that for the horizontal Main pump points, the discrete frequency components at 4x Booster pump RPM will be extracted from the overall value using the mean-squared subtraction method. The modified (corrected) overall values (points P3H and P4H) resulting from the extraction of the discrete peak at 4xBooster pump RPM will be reviewed separately for change, and trended as a supplemental vibration performance monitoring activity.
Table Main Pump on page 104 of 175 states:
Table-1, Main Pump**
Test Vibration Point Proposed Proposed Alert Range Required Parameter Acceptable Range Action Limit (Note 2)**
Vv Main pump (Note 1.1Vr >1.1 Vr to 1.3 Vr >1.3 Vr 1)** Horizontal Inboard (P3H) but not or or
>1.06 in/sec >1.06 to 1.26 in/sec >1.26 in/sec Vv Main pump (Note 1.1Vr >1.5 Vr to 6 Vr >1.3 Vr 1)** Horizontal Outboard (P4H) but not or or
>0.700 in/sec >0.700 to 0.83 in/sec >0.83 in/sec Vv Main pump 1.5Vr >1.5 Vr to 6 Vr >6 Vr Vertical Inboard (P3V) but not or or
>0.450 in/sec >0.450 to 0.70 in/sec >0.70 in/sec Vv Main pump 2.5Vr >2.5 Vr to 6 Vr >6 Vr Vertical Outboard (P4V) but not or Or
>0.325 in/sec >0.325 to 0.70 in/sec >0.70 in/sec Vv Main pump 1.5Vr >1.5 Vr to 6 Vr >6 Vr Axial Inboard but not or or (P3A)
>0.500 in/sec >0.500 to 0.70 in/sec >0.70 in/sec Notes:
- 1. ** For the main pump horizontal vibration points P3H and P4H, a frequency spectrum analysis will be performed following each pump vibration operability test, and the discrete peak at 4x booster pump (4xBP) RPM will be extracted (using the mean-squared subtraction method) from the vibration spectrum overall value. In addition to the Alert and Required Action limits, the modified P3H and P4H overall values, resulting from the extraction of the discrete peak at 4xBP RPM, will be reviewed and trended as a supplemental vibration performance monitoring activity.
Question for Pilgrim, please explain the following All the wording in above paragraphs says that discrete peak will be extracted (filtered),
whereas the values shown in table all full values (unfiltered) without any extraction. Or NRC staff is missing anything.